31704997 has 4 divisors (see below), whose sum is σ = 31762476. Its totient is φ = 31647520.

The previous prime is 31704989. The next prime is 31705021. The reversal of 31704997 is 79940713.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15952036 + 15752961 = 3994^2 + 3969^2 .

It is a cyclic number.

It is not a de Polignac number, because 31704997 - 2³ = 31704989 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31704697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27904 + ... + 29017.

It is an arithmetic number, because the mean of its divisors is an integer number (7940619).

Almost surely, 2^31704997 is an apocalyptic number.

It is an amenable number.

31704997 is a deficient number, since it is larger than the sum of its proper divisors (57479).

31704997 is an equidigital number, since it uses as much as digits as its factorization.

31704997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57478.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 31704997 is about 5630.7190482211. The cubic root of 31704997 is about 316.5015968247.

The spelling of 31704997 in words is "thirty-one million, seven hundred four thousand, nine hundred ninety-seven".