31240913 has 16 divisors (see below), whose sum is σ = 35622720. Its totient is φ = 27144000.

The previous prime is 31240889. The next prime is 31240931. The reversal of 31240913 is 31904213.

It is a cyclic number.

It is not a de Polignac number, because 31240913 - 2²⁴ = 14463697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31240933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23363 + ... + 24663.

It is an arithmetic number, because the mean of its divisors is an integer number (2226420).

Almost surely, 2^31240913 is an apocalyptic number.

It is an amenable number.

31240913 is a deficient number, since it is larger than the sum of its proper divisors (4381807).

31240913 is a wasteful number, since it uses less digits than its factorization.

31240913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31240913 is about 5589.3571186676. The cubic root of 31240913 is about 314.9497291071.

The spelling of 31240913 in words is "thirty-one million, two hundred forty thousand, nine hundred thirteen".