31634021 has 2 divisors, whose sum is σ = 31634022. Its totient is φ = 31634020.

The previous prime is 31633999. The next prime is 31634033. The reversal of 31634021 is 12043613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24611521 + 7022500 = 4961^2 + 2650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31634021 is a prime.

It is a super-2 number, since 2×31634021² = 2001422569256882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31633984 and 31634002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31634321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15817010 + 15817011.

It is an arithmetic number, because the mean of its divisors is an integer number (15817011).

Almost surely, 2^31634021 is an apocalyptic number.

It is an amenable number.

31634021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31634021 is an equidigital number, since it uses as much as digits as its factorization.

31634021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31634021 is about 5624.4129471439. The cubic root of 31634021 is about 316.2652429029.

Adding to 31634021 its reverse (12043613), we get a palindrome (43677634).

The spelling of 31634021 in words is "thirty-one million, six hundred thirty-four thousand, twenty-one".