31321235137 has 8 divisors (see below), whose sum is σ = 31428214272. Its totient is φ = 31214296800.

The previous prime is 31321235123. The next prime is 31321235191. The reversal of 31321235137 is 73153212313.

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 31321235137 - 2²⁷ = 31187017409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31321235099 and 31321235108.

It is not an unprimeable number, because it can be changed into a prime (31321235117) 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 7 ways as a sum of consecutive naturals, for example, 2990013 + ... + 3000469.

It is an arithmetic number, because the mean of its divisors is an integer number (3928526784).

Almost surely, 2^31321235137 is an apocalyptic number.

It is an amenable number.

31321235137 is a deficient number, since it is larger than the sum of its proper divisors (106979135).

31321235137 is a wasteful number, since it uses less digits than its factorization.

31321235137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20399.

The product of its digits is 11340, while the sum is 31.

The spelling of 31321235137 in words is "thirty-one billion, three hundred twenty-one million, two hundred thirty-five thousand, one hundred thirty-seven".