31551135121 has 32 divisors (see below), whose sum is σ = 37195200000. Its totient is φ = 26452944000.

The previous prime is 31551135113. The next prime is 31551135139. The reversal of 31551135121 is 12153115513.

It is a cyclic number.

It is not a de Polignac number, because 31551135121 - 2³ = 31551135113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31551135121.

It is not an unprimeable number, because it can be changed into a prime (31551135181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4203630 + ... + 4211128.

It is an arithmetic number, because the mean of its divisors is an integer number (1162350000).

Almost surely, 2^31551135121 is an apocalyptic number.

It is an amenable number.

31551135121 is a deficient number, since it is larger than the sum of its proper divisors (5644064879).

31551135121 is a wasteful number, since it uses less digits than its factorization.

31551135121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8061.

The product of its digits is 2250, while the sum is 28.

The spelling of 31551135121 in words is "thirty-one billion, five hundred fifty-one million, one hundred thirty-five thousand, one hundred twenty-one".