157731265 has 8 divisors (see below), whose sum is σ = 189694440. Its totient is φ = 125907072.

The previous prime is 157731239. The next prime is 157731269. The reversal of 157731265 is 562137751.

It can be written as a sum of positive squares in 4 ways, for example, as 25573249 + 132158016 = 5057^2 + 11496^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 157731265 - 2⁷ = 157731137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157731269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32230 + ... + 36799.

It is an arithmetic number, because the mean of its divisors is an integer number (23711805).

Almost surely, 2^157731265 is an apocalyptic number.

It is an amenable number.

157731265 is a deficient number, since it is larger than the sum of its proper divisors (31963175).

157731265 is an equidigital number, since it uses as much as digits as its factorization.

157731265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69491.

The product of its digits is 44100, while the sum is 37.

The square root of 157731265 is about 12559.1108363610. The cubic root of 157731265 is about 540.3053428578.

The spelling of 157731265 in words is "one hundred fifty-seven million, seven hundred thirty-one thousand, two hundred sixty-five".