31021232313 has 16 divisors (see below), whose sum is σ = 43563350016. Its totient is φ = 19596775440.

The previous prime is 31021232269. The next prime is 31021232329. The reversal of 31021232313 is 31323212013.

It is not a de Polignac number, because 31021232313 - 2²⁶ = 30954123449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31021232313.

It is not an unprimeable number, because it can be changed into a prime (31021232383) 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, 2093473 + ... + 2108238.

It is an arithmetic number, because the mean of its divisors is an integer number (2722709376).

Almost surely, 2^31021232313 is an apocalyptic number.

It is an amenable number.

31021232313 is a deficient number, since it is larger than the sum of its proper divisors (12542117703).

31021232313 is a wasteful number, since it uses less digits than its factorization.

31021232313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201844.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31021232313 its reverse (31323212013), we get a palindrome (62344444326).

The spelling of 31021232313 in words is "thirty-one billion, twenty-one million, two hundred thirty-two thousand, three hundred thirteen".