31320323131 has 4 divisors (see below), whose sum is σ = 31482604792. Its totient is φ = 31158041472.

The previous prime is 31320323107. The next prime is 31320323143. The reversal of 31320323131 is 13132302313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31320323131 - 2⁷ = 31320323003 is a prime.

It is a super-2 number, since 2×31320323131² (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 (31320323231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81140541 + ... + 81140926.

It is an arithmetic number, because the mean of its divisors is an integer number (7870651198).

Almost surely, 2^31320323131 is an apocalyptic number.

31320323131 is a deficient number, since it is larger than the sum of its proper divisors (162281661).

31320323131 is a wasteful number, since it uses less digits than its factorization.

31320323131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162281660.

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

Adding to 31320323131 its reverse (13132302313), we get a palindrome (44452625444).

The spelling of 31320323131 in words is "thirty-one billion, three hundred twenty million, three hundred twenty-three thousand, one hundred thirty-one".