31223001131 has 32 divisors (see below), whose sum is σ = 39011328000. Its totient is φ = 24393694752.

The previous prime is 31223001127. The next prime is 31223001151. The reversal of 31223001131 is 13110032213.

It is not a de Polignac number, because 31223001131 - 2² = 31223001127 is a prime.

It is a super-2 number, since 2×31223001131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223001151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 326480 + ... + 411138.

It is an arithmetic number, because the mean of its divisors is an integer number (1219104000).

Almost surely, 2^31223001131 is an apocalyptic number.

31223001131 is a deficient number, since it is larger than the sum of its proper divisors (7788326869).

31223001131 is a wasteful number, since it uses less digits than its factorization.

31223001131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84791.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31223001131 its reverse (13110032213), we get a palindrome (44333033344).

The spelling of 31223001131 in words is "thirty-one billion, two hundred twenty-three million, one thousand, one hundred thirty-one".