140264561 has 8 divisors (see below), whose sum is σ = 145741800. Its totient is φ = 134830080.

The previous prime is 140264533. The next prime is 140264611. The reversal of 140264561 is 165462041.

It can be written as a sum of positive squares in 4 ways, for example, as 70224400 + 70040161 = 8380^2 + 8369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140264561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140164561) 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 7 ways as a sum of consecutive naturals, for example, 3920 + ... + 17201.

It is an arithmetic number, because the mean of its divisors is an integer number (18217725).

Almost surely, 2^140264561 is an apocalyptic number.

140264561 is the 5297-th centered decagonal number.

It is an amenable number.

140264561 is a deficient number, since it is larger than the sum of its proper divisors (5477239).

140264561 is a wasteful number, since it uses less digits than its factorization.

140264561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21379.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 140264561 is about 11843.3340322732. The cubic root of 140264561 is about 519.5762832842.

The spelling of 140264561 in words is "one hundred forty million, two hundred sixty-four thousand, five hundred sixty-one".