31313220321131 has 16 divisors (see below), whose sum is σ = 35798260555200. Its totient is φ = 26831112081408.

The previous prime is 31313220321107. The next prime is 31313220321277. The reversal of 31313220321131 is 13112302231313.

It is a cyclic number.

It is not a de Polignac number, because 31313220321131 - 2¹⁸ = 31313220058987 is a prime.

It is a super-2 number, since 2×31313220321131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31313220321131.

It is not an unprimeable number, because it can be changed into a prime (31313220321431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362424485 + ... + 362510873.

It is an arithmetic number, because the mean of its divisors is an integer number (2237391284700).

Almost surely, 2^{31313220321131} is an apocalyptic number.

31313220321131 is a deficient number, since it is larger than the sum of its proper divisors (4485040234069).

31313220321131 is a wasteful number, since it uses less digits than its factorization.

31313220321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102758.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31313220321131 its reverse (13112302231313), we get a palindrome (44425522552444).

The spelling of 31313220321131 in words is "thirty-one trillion, three hundred thirteen billion, two hundred twenty million, three hundred twenty-one thousand, one hundred thirty-one".