31109990157 has 24 divisors (see below), whose sum is σ = 50084199360. Its totient is φ = 18492624000.

The previous prime is 31109990129. The next prime is 31109990173. The reversal of 31109990157 is 75109990113.

It is a happy number.

It is not a de Polignac number, because 31109990157 - 2⁸ = 31109989901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31109910157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5347969 + ... + 5353782.

It is an arithmetic number, because the mean of its divisors is an integer number (2086841640).

Almost surely, 2^31109990157 is an apocalyptic number.

It is an amenable number.

31109990157 is a deficient number, since it is larger than the sum of its proper divisors (18974209203).

31109990157 is a wasteful number, since it uses less digits than its factorization.

31109990157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10701793 (or 10701790 counting only the distinct ones).

The product of its (nonzero) digits is 76545, while the sum is 45.

The spelling of 31109990157 in words is "thirty-one billion, one hundred nine million, nine hundred ninety thousand, one hundred fifty-seven".