31677913 has 2 divisors, whose sum is σ = 31677914. Its totient is φ = 31677912.

The previous prime is 31677911. The next prime is 31677917. The reversal of 31677913 is 31977613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24235929 + 7441984 = 4923^2 + 2728^2 .

It is a cyclic number.

It is not a de Polignac number, because 31677913 - 2¹ = 31677911 is a prime.

Together with 31677911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31677911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15838956 + 15838957.

It is an arithmetic number, because the mean of its divisors is an integer number (15838957).

Almost surely, 2^31677913 is an apocalyptic number.

It is an amenable number.

31677913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31677913 is an equidigital number, since it uses as much as digits as its factorization.

31677913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 37.

The square root of 31677913 is about 5628.3135129451. The cubic root of 31677913 is about 316.4114472991.

The spelling of 31677913 in words is "thirty-one million, six hundred seventy-seven thousand, nine hundred thirteen".