31723697 has 2 divisors, whose sum is σ = 31723698. Its totient is φ = 31723696.

The previous prime is 31723669. The next prime is 31723759. The reversal of 31723697 is 79632713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16638241 + 15085456 = 4079^2 + 3884^2 .

It is a cyclic number.

It is not a de Polignac number, because 31723697 - 2¹⁸ = 31461553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31723697.

It is not a weakly prime, because it can be changed into another prime (31723607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15861848 + 15861849.

It is an arithmetic number, because the mean of its divisors is an integer number (15861849).

Almost surely, 2^31723697 is an apocalyptic number.

It is an amenable number.

31723697 is a deficient number, since it is larger than the sum of its proper divisors (1).

31723697 is an equidigital number, since it uses as much as digits as its factorization.

31723697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 38.

The square root of 31723697 is about 5632.3793373671. The cubic root of 31723697 is about 316.5638101158.

The spelling of 31723697 in words is "thirty-one million, seven hundred twenty-three thousand, six hundred ninety-seven".