31113321 has 4 divisors (see below), whose sum is σ = 41484432. Its totient is φ = 20742212.

The previous prime is 31113311. The next prime is 31113323. The reversal of 31113321 is 12331113.

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 a cyclic number.

It is not a de Polignac number, because 31113321 - 2⁵ = 31113289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31113321.

It is not an unprimeable number, because it can be changed into a prime (31113323) 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, 5185551 + ... + 5185556.

It is an arithmetic number, because the mean of its divisors is an integer number (10371108).

Almost surely, 2^31113321 is an apocalyptic number.

It is an amenable number.

31113321 is a deficient number, since it is larger than the sum of its proper divisors (10371111).

31113321 is a wasteful number, since it uses less digits than its factorization.

31113321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10371110.

The product of its digits is 54, while the sum is 15.

The square root of 31113321 is about 5577.9316058912. The cubic root of 31113321 is about 314.5203786873.

Adding to 31113321 its reverse (12331113), we get a palindrome (43444434).

The spelling of 31113321 in words is "thirty-one million, one hundred thirteen thousand, three hundred twenty-one".