31813241 has 4 divisors (see below), whose sum is σ = 31876992. Its totient is φ = 31749492.

The previous prime is 31813237. The next prime is 31813291. The reversal of 31813241 is 14231813.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14231813 = 2531 ⋅5623.

It is a cyclic number.

It is not a de Polignac number, because 31813241 - 2² = 31813237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31813291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31121 + ... + 32126.

It is an arithmetic number, because the mean of its divisors is an integer number (7969248).

Almost surely, 2^31813241 is an apocalyptic number.

It is an amenable number.

31813241 is a deficient number, since it is larger than the sum of its proper divisors (63751).

31813241 is an equidigital number, since it uses as much as digits as its factorization.

31813241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63750.

The product of its digits is 576, while the sum is 23.

The square root of 31813241 is about 5640.3227744518. The cubic root of 31813241 is about 316.8613769597.

The spelling of 31813241 in words is "thirty-one million, eight hundred thirteen thousand, two hundred forty-one".