157890529 has 4 divisors (see below), whose sum is σ = 163335060. Its totient is φ = 152446000.

The previous prime is 157890521. The next prime is 157890547. The reversal of 157890529 is 925098751.

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 126787600 + 31102929 = 11260^2 + 5577^2 .

It is a cyclic number.

It is not a de Polignac number, because 157890529 - 2³ = 157890521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157890521) 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, 2722222 + ... + 2722279.

It is an arithmetic number, because the mean of its divisors is an integer number (40833765).

Almost surely, 2^157890529 is an apocalyptic number.

It is an amenable number.

157890529 is a deficient number, since it is larger than the sum of its proper divisors (5444531).

157890529 is an equidigital number, since it uses as much as digits as its factorization.

157890529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444530.

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 157890529 is about 12565.4498128798. The cubic root of 157890529 is about 540.4871335846.

The spelling of 157890529 in words is "one hundred fifty-seven million, eight hundred ninety thousand, five hundred twenty-nine".