31283870913 has 24 divisors (see below), whose sum is σ = 45454465056. Its totient is φ = 20733148800.

The previous prime is 31283870911. The next prime is 31283870941. The reversal of 31283870913 is 31907838213.

It is a happy number.

It is not a de Polignac number, because 31283870913 - 2¹ = 31283870911 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31283870911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1260918 + ... + 1285488.

It is an arithmetic number, because the mean of its divisors is an integer number (1893936044).

Almost surely, 2^31283870913 is an apocalyptic number.

It is an amenable number.

31283870913 is a deficient number, since it is larger than the sum of its proper divisors (14170594143).

31283870913 is a wasteful number, since it uses less digits than its factorization.

31283870913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25405 (or 25402 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 31283870913 in words is "thirty-one billion, two hundred eighty-three million, eight hundred seventy thousand, nine hundred thirteen".