31130969 has 4 divisors (see below), whose sum is σ = 31142160. Its totient is φ = 31119780.

The previous prime is 31130959. The next prime is 31130989. The reversal of 31130969 is 96903113.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31130969 - 2⁸ = 31130713 is a prime.

It is a super-2 number, since 2×31130969² = 1938274461757922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31130929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2174 + ... + 8184.

It is an arithmetic number, because the mean of its divisors is an integer number (7785540).

Almost surely, 2^31130969 is an apocalyptic number.

It is an amenable number.

31130969 is a deficient number, since it is larger than the sum of its proper divisors (11191).

31130969 is an equidigital number, since it uses as much as digits as its factorization.

31130969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11190.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 31130969 is about 5579.5133300316. The cubic root of 31130969 is about 314.5798345336.

The spelling of 31130969 in words is "thirty-one million, one hundred thirty thousand, nine hundred sixty-nine".