31315413 has 4 divisors (see below), whose sum is σ = 41753888. Its totient is φ = 20876940.

The previous prime is 31315393. The next prime is 31315423. The reversal of 31315413 is 31451313.

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.

It is not a de Polignac number, because 31315413 - 2⁵ = 31315381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31315413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31315423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5219233 + ... + 5219238.

It is an arithmetic number, because the mean of its divisors is an integer number (10438472).

Almost surely, 2^31315413 is an apocalyptic number.

It is an amenable number.

31315413 is a deficient number, since it is larger than the sum of its proper divisors (10438475).

31315413 is a wasteful number, since it uses less digits than its factorization.

31315413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10438474.

The product of its digits is 540, while the sum is 21.

The square root of 31315413 is about 5596.0176018308. The cubic root of 31315413 is about 315.1998832154.

Adding to 31315413 its reverse (31451313), we get a palindrome (62766726).

The spelling of 31315413 in words is "thirty-one million, three hundred fifteen thousand, four hundred thirteen".