31683997 has 2 divisors, whose sum is σ = 31683998. Its totient is φ = 31683996.

The previous prime is 31683973. The next prime is 31684007. The reversal of 31683997 is 79938613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30625156 + 1058841 = 5534^2 + 1029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31683997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31683907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15841998 + 15841999.

It is an arithmetic number, because the mean of its divisors is an integer number (15841999).

Almost surely, 2^31683997 is an apocalyptic number.

It is an amenable number.

31683997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31683997 is an equidigital number, since it uses as much as digits as its factorization.

31683997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 31683997 is about 5628.8539686156. The cubic root of 31683997 is about 316.4317024636.

The spelling of 31683997 in words is "thirty-one million, six hundred eighty-three thousand, nine hundred ninety-seven".