31213413 has 48 divisors (see below), whose sum is σ = 57073536. Its totient is φ = 15966720.

The previous prime is 31213397. The next prime is 31213417. The reversal of 31213413 is 31431213.

It is not a de Polignac number, because 31213413 - 2⁴ = 31213397 is a prime.

It is a super-2 number, since 2×31213413² = 1948554302217138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213417) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50281 + ... + 50897.

It is an arithmetic number, because the mean of its divisors is an integer number (1189032).

Almost surely, 2^31213413 is an apocalyptic number.

31213413 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31213413 is a deficient number, since it is larger than the sum of its proper divisors (25860123).

31213413 is a wasteful number, since it uses less digits than its factorization.

31213413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 711 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 31213413 is about 5586.8965445943. The cubic root of 31213413 is about 314.8572898526.

Adding to 31213413 its reverse (31431213), we get a palindrome (62644626).

It can be divided in two parts, 31213 and 413, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 31213413 in words is "thirty-one million, two hundred thirteen thousand, four hundred thirteen".