31633421 has 4 divisors (see below), whose sum is σ = 32230332. Its totient is φ = 31036512.

The previous prime is 31633391. The next prime is 31633429. The reversal of 31633421 is 12433613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12433613 = 17 ⋅731389.

It can be written as a sum of positive squares in 2 ways, for example, as 13875625 + 17757796 = 3725^2 + 4214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31633421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31633429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298376 + ... + 298481.

It is an arithmetic number, because the mean of its divisors is an integer number (8057583).

Almost surely, 2^31633421 is an apocalyptic number.

It is an amenable number.

31633421 is a deficient number, since it is larger than the sum of its proper divisors (596911).

31633421 is an equidigital number, since it uses as much as digits as its factorization.

31633421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596910.

The product of its digits is 1296, while the sum is 23.

The square root of 31633421 is about 5624.3596079909. The cubic root of 31633421 is about 316.2632433642.

The spelling of 31633421 in words is "thirty-one million, six hundred thirty-three thousand, four hundred twenty-one".