31012132013 has 4 divisors (see below), whose sum is σ = 31013165568. Its totient is φ = 31011098460.

The previous prime is 31012132009. The next prime is 31012132069. The reversal of 31012132013 is 31023121013.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31023121013 = 523 ⋅59317631.

It is a cyclic number.

It is not a de Polignac number, because 31012132013 - 2² = 31012132009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31012131982 and 31012132000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012132093) 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, 470381 + ... + 532242.

It is an arithmetic number, because the mean of its divisors is an integer number (7753291392).

Almost surely, 2^31012132013 is an apocalyptic number.

It is an amenable number.

31012132013 is a deficient number, since it is larger than the sum of its proper divisors (1033555).

31012132013 is a wasteful number, since it uses less digits than its factorization.

31012132013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033554.

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

Adding to 31012132013 its reverse (31023121013), we get a palindrome (62035253026).

The spelling of 31012132013 in words is "thirty-one billion, twelve million, one hundred thirty-two thousand, thirteen".