31103231 has 4 divisors (see below), whose sum is σ = 31151952. Its totient is φ = 31054512.

The previous prime is 31103227. The next prime is 31103239. The reversal of 31103231 is 13230113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31103231 - 2² = 31103227 is a prime.

It is a super-2 number, since 2×31103231² = 1934821957278722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103239) 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, 23390 + ... + 24683.

It is an arithmetic number, because the mean of its divisors is an integer number (7787988).

Almost surely, 2^31103231 is an apocalyptic number.

31103231 is a deficient number, since it is larger than the sum of its proper divisors (48721).

31103231 is an equidigital number, since it uses as much as digits as its factorization.

31103231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48720.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31103231 is about 5577.0270754229. The cubic root of 31103231 is about 314.4863755269.

Adding to 31103231 its reverse (13230113), we get a palindrome (44333344).

The spelling of 31103231 in words is "thirty-one million, one hundred three thousand, two hundred thirty-one".