157998931 has 16 divisors (see below), whose sum is σ = 167076000. Its totient is φ = 149200128.

The previous prime is 157998857. The next prime is 157998943. The reversal of 157998931 is 139899751.

It is a happy number.

It is not a de Polignac number, because 157998931 - 2⁹ = 157998419 is a prime.

It is a super-2 number, since 2×157998931² = 49927324394285522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157998031) 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 15 ways as a sum of consecutive naturals, for example, 452545 + ... + 452893.

It is an arithmetic number, because the mean of its divisors is an integer number (10442250).

Almost surely, 2^157998931 is an apocalyptic number.

157998931 is a deficient number, since it is larger than the sum of its proper divisors (9077069).

157998931 is a wasteful number, since it uses less digits than its factorization.

157998931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678.

The product of its digits is 612360, while the sum is 52.

The square root of 157998931 is about 12569.7625673678. The cubic root of 157998931 is about 540.6107983439.

The spelling of 157998931 in words is "one hundred fifty-seven million, nine hundred ninety-eight thousand, nine hundred thirty-one".