31240012013 has 32 divisors (see below), whose sum is σ = 37953208320. Its totient is φ = 25144706880.

The previous prime is 31240012009. The next prime is 31240012049. The reversal of 31240012013 is 31021004213.

It is a cyclic number.

It is not a de Polignac number, because 31240012013 - 2² = 31240012009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31240011982 and 31240012000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240012313) 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, 3070028 + ... + 3080186.

It is an arithmetic number, because the mean of its divisors is an integer number (1186037760).

Almost surely, 2^31240012013 is an apocalyptic number.

It is an amenable number.

31240012013 is a deficient number, since it is larger than the sum of its proper divisors (6713196307).

31240012013 is a wasteful number, since it uses less digits than its factorization.

31240012013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10617.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31240012013 its reverse (31021004213), we get a palindrome (62261016226).

The spelling of 31240012013 in words is "thirty-one billion, two hundred forty million, twelve thousand, thirteen".