31618949 has 2 divisors, whose sum is σ = 31618950. Its totient is φ = 31618948.

The previous prime is 31618943. The next prime is 31618981. The reversal of 31618949 is 94981613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 11682724 = 4465^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 31618949 - 2⁸ = 31618693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31618943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15809474 + 15809475.

It is an arithmetic number, because the mean of its divisors is an integer number (15809475).

Almost surely, 2^31618949 is an apocalyptic number.

It is an amenable number.

31618949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31618949 is an equidigital number, since it uses as much as digits as its factorization.

31618949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 31618949 is about 5623.0729143414. The cubic root of 31618949 is about 316.2150068298.

The spelling of 31618949 in words is "thirty-one million, six hundred eighteen thousand, nine hundred forty-nine".