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140545621 = 584924029
BaseRepresentation
bin10000110000010…
…00111001010101
3100210110110100101
420120020321111
5241434424441
621540214101
73324421666
oct1030107125
9323413311
10140545621
1172375007
123b09a331
132316b7b8
141494736d
15c513231
hex8608e55

140545621 has 4 divisors (see below), whose sum is σ = 140575500. Its totient is φ = 140515744.

The previous prime is 140545619. The next prime is 140545627. The reversal of 140545621 is 126545041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126545041 = 718077863.

It can be written as a sum of positive squares in 2 ways, for example, as 109620900 + 30924721 = 10470^2 + 5561^2 .

It is a cyclic number.

It is not a de Polignac number, because 140545621 - 21 = 140545619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140545621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140545627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6166 + ... + 17863.

It is an arithmetic number, because the mean of its divisors is an integer number (35143875).

Almost surely, 2140545621 is an apocalyptic number.

It is an amenable number.

140545621 is a deficient number, since it is larger than the sum of its proper divisors (29879).

140545621 is an equidigital number, since it uses as much as digits as its factorization.

140545621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29878.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 140545621 is about 11855.1938406759. The cubic root of 140545621 is about 519.9230914364.

The spelling of 140545621 in words is "one hundred forty million, five hundred forty-five thousand, six hundred twenty-one".

Divisors: 1 5849 24029 140545621