31240413 has 12 divisors (see below), whose sum is σ = 45354400. Its totient is φ = 20721096.

The previous prime is 31240399. The next prime is 31240439. The reversal of 31240413 is 31404213.

It is not a de Polignac number, because 31240413 - 2⁴ = 31240397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6931 + ... + 10512.

Almost surely, 2^31240413 is an apocalyptic number.

It is an amenable number.

31240413 is a deficient number, since it is larger than the sum of its proper divisors (14113987).

31240413 is a wasteful number, since it uses less digits than its factorization.

31240413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17648 (or 17645 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31240413 is about 5589.3123906255. The cubic root of 31240413 is about 314.9480488777.

Adding to 31240413 its reverse (31404213), we get a palindrome (62644626).

The spelling of 31240413 in words is "thirty-one million, two hundred forty thousand, four hundred thirteen".