31320965 has 8 divisors (see below), whose sum is σ = 40476408. Its totient is φ = 23129280.

The previous prime is 31320937. The next prime is 31320967. The reversal of 31320965 is 56902313.

It can be written as a sum of positive squares in 4 ways, for example, as 7134241 + 24186724 = 2671^2 + 4918^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31320965 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240866 + ... + 240995.

It is an arithmetic number, because the mean of its divisors is an integer number (5059551).

Almost surely, 2^31320965 is an apocalyptic number.

It is an amenable number.

31320965 is a deficient number, since it is larger than the sum of its proper divisors (9155443).

31320965 is a wasteful number, since it uses less digits than its factorization.

31320965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481879.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 31320965 is about 5596.5136469055. The cubic root of 31320965 is about 315.2185096805.

The spelling of 31320965 in words is "thirty-one million, three hundred twenty thousand, nine hundred sixty-five".