31313132131 has 4 divisors (see below), whose sum is σ = 31316500152. Its totient is φ = 31309764112.

The previous prime is 31313132129. The next prime is 31313132189. The reversal of 31313132131 is 13123131313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13123131313 = 8093 ⋅1621541.

It is a cyclic number.

It is not a de Polignac number, because 31313132131 - 2¹ = 31313132129 is a prime.

It is a super-2 number, since 2×31313132131² (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 (31313132231) 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, 1670026 + ... + 1688671.

It is an arithmetic number, because the mean of its divisors is an integer number (7829125038).

Almost surely, 2^31313132131 is an apocalyptic number.

31313132131 is a deficient number, since it is larger than the sum of its proper divisors (3368021).

31313132131 is an equidigital number, since it uses as much as digits as its factorization.

31313132131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368020.

The product of its digits is 486, while the sum is 22.

Adding to 31313132131 its reverse (13123131313), we get a palindrome (44436263444).

The spelling of 31313132131 in words is "thirty-one billion, three hundred thirteen million, one hundred thirty-two thousand, one hundred thirty-one".