31645949 has 2 divisors, whose sum is σ = 31645950. Its totient is φ = 31645948.

The previous prime is 31645927. The next prime is 31645981. The reversal of 31645949 is 94954613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23833924 + 7812025 = 4882^2 + 2795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31645949 is a prime.

It is a super-2 number, since 2×31645949² = 2002932176221202, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31645919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15822974 + 15822975.

It is an arithmetic number, because the mean of its divisors is an integer number (15822975).

Almost surely, 2^31645949 is an apocalyptic number.

It is an amenable number.

31645949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31645949 is an equidigital number, since it uses as much as digits as its factorization.

31645949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 31645949 is about 5625.4732245385. The cubic root of 31645949 is about 316.3049884854.

The spelling of 31645949 in words is "thirty-one million, six hundred forty-five thousand, nine hundred forty-nine".