31021323313 has 4 divisors (see below), whose sum is σ = 32654024560. Its totient is φ = 29388622068.

The previous prime is 31021323299. The next prime is 31021323331. The reversal of 31021323313 is 31332312013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31021323313 - 2¹³ = 31021315121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31021323383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816350595 + ... + 816350632.

It is an arithmetic number, because the mean of its divisors is an integer number (8163506140).

Almost surely, 2^31021323313 is an apocalyptic number.

It is an amenable number.

31021323313 is a deficient number, since it is larger than the sum of its proper divisors (1632701247).

31021323313 is a wasteful number, since it uses less digits than its factorization.

31021323313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632701246.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31021323313 its reverse (31332312013), we get a palindrome (62353635326).

The spelling of 31021323313 in words is "thirty-one billion, twenty-one million, three hundred twenty-three thousand, three hundred thirteen".