31135157121 has 16 divisors (see below), whose sum is σ = 42640625664. Its totient is φ = 20193364224.

The previous prime is 31135157113. The next prime is 31135157143. The reversal of 31135157121 is 12175153113.

It is not a de Polignac number, because 31135157121 - 2³ = 31135157113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31135157111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1781401 + ... + 1798793.

It is an arithmetic number, because the mean of its divisors is an integer number (2665039104).

Almost surely, 2^31135157121 is an apocalyptic number.

It is an amenable number.

31135157121 is a deficient number, since it is larger than the sum of its proper divisors (11505468543).

31135157121 is a wasteful number, since it uses less digits than its factorization.

31135157121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33560.

The product of its digits is 3150, while the sum is 30.

The spelling of 31135157121 in words is "thirty-one billion, one hundred thirty-five million, one hundred fifty-seven thousand, one hundred twenty-one".