31690453 has 4 divisors (see below), whose sum is σ = 31775788. Its totient is φ = 31605120.

The previous prime is 31690447. The next prime is 31690487. The reversal of 31690453 is 35409613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35409613 = 701 ⋅50513.

It can be written as a sum of positive squares in 2 ways, for example, as 20007729 + 11682724 = 4473^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 31690453 - 2⁹ = 31689941 is a prime.

It is a super-2 number, since 2×31690453² = 2008569622690418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31690403) 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, 42108 + ... + 42853.

It is an arithmetic number, because the mean of its divisors is an integer number (7943947).

Almost surely, 2^31690453 is an apocalyptic number.

It is an amenable number.

31690453 is a deficient number, since it is larger than the sum of its proper divisors (85335).

31690453 is an equidigital number, since it uses as much as digits as its factorization.

31690453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85334.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 31690453 is about 5629.4274131567. The cubic root of 31690453 is about 316.4531932742.

The spelling of 31690453 in words is "thirty-one million, six hundred ninety thousand, four hundred fifty-three".