157890031 has 4 divisors (see below), whose sum is σ = 170035432. Its totient is φ = 145744632.

The previous prime is 157890017. The next prime is 157890049. The reversal of 157890031 is 130098751.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 157890031 - 2⁷ = 157889903 is a prime.

It is a super-2 number, since 2×157890031² = 49858523778361922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157890001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6072681 + ... + 6072706.

It is an arithmetic number, because the mean of its divisors is an integer number (42508858).

Almost surely, 2^157890031 is an apocalyptic number.

157890031 is a deficient number, since it is larger than the sum of its proper divisors (12145401).

157890031 is a wasteful number, since it uses less digits than its factorization.

157890031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12145400.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 157890031 is about 12565.4299966217. The cubic root of 157890031 is about 540.4865653367.

The spelling of 157890031 in words is "one hundred fifty-seven million, eight hundred ninety thousand, thirty-one".