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125421101 = 139647777
BaseRepresentation
bin1110111100111…
…00011000101101
322202000001101222
413132130120231
5224101433401
620240113125
73052030121
oct736343055
9282001358
10125421101
1164884803
12360057a5
131cca4590
141292b581
15b026c1b
hex779c62d

125421101 has 4 divisors (see below), whose sum is σ = 135068892. Its totient is φ = 115773312.

The previous prime is 125421059. The next prime is 125421137. The reversal of 125421101 is 101124521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26020201 + 99400900 = 5101^2 + 9970^2 .

It is a cyclic number.

It is not a de Polignac number, because 125421101 - 210 = 125420077 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 125421101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125421151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4823876 + ... + 4823901.

It is an arithmetic number, because the mean of its divisors is an integer number (33767223).

Almost surely, 2125421101 is an apocalyptic number.

It is an amenable number.

125421101 is a deficient number, since it is larger than the sum of its proper divisors (9647791).

125421101 is an equidigital number, since it uses as much as digits as its factorization.

125421101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9647790.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 125421101 is about 11199.1562628619. The cubic root of 125421101 is about 500.5608386847.

Adding to 125421101 its reverse (101124521), we get a palindrome (226545622).

The spelling of 125421101 in words is "one hundred twenty-five million, four hundred twenty-one thousand, one hundred one".

Divisors: 1 13 9647777 125421101