31945369 has 2 divisors, whose sum is σ = 31945370. Its totient is φ = 31945368.

The previous prime is 31945343. The next prime is 31945387. The reversal of 31945369 is 96354913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30969225 + 976144 = 5565^2 + 988^2 .

It is a cyclic number.

It is not a de Polignac number, because 31945369 - 2⁵ = 31945337 is a prime.

It is a super-2 number, since 2×31945369² = 2041013201092322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31945339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15972684 + 15972685.

It is an arithmetic number, because the mean of its divisors is an integer number (15972685).

Almost surely, 2^31945369 is an apocalyptic number.

It is an amenable number.

31945369 is a deficient number, since it is larger than the sum of its proper divisors (1).

31945369 is an equidigital number, since it uses as much as digits as its factorization.

31945369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 40.

The square root of 31945369 is about 5652.0234429804. The cubic root of 31945369 is about 317.2994380926.

The spelling of 31945369 in words is "thirty-one million, nine hundred forty-five thousand, three hundred sixty-nine".