31690673 has 4 divisors (see below), whose sum is σ = 36217920. Its totient is φ = 27163428.

The previous prime is 31690639. The next prime is 31690679. The reversal of 31690673 is 37609613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31690673 - 2⁶ = 31690609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31690679) 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, 2263613 + ... + 2263626.

It is an arithmetic number, because the mean of its divisors is an integer number (9054480).

Almost surely, 2^31690673 is an apocalyptic number.

It is an amenable number.

31690673 is a deficient number, since it is larger than the sum of its proper divisors (4527247).

31690673 is an equidigital number, since it uses as much as digits as its factorization.

31690673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527246.

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 31690673 is about 5629.4469532983. The cubic root of 31690673 is about 316.4539255614.

The spelling of 31690673 in words is "thirty-one million, six hundred ninety thousand, six hundred seventy-three".