31644131 has 2 divisors, whose sum is σ = 31644132. Its totient is φ = 31644130.

The previous prime is 31644103. The next prime is 31644143. The reversal of 31644131 is 13144613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31644131 - 2²² = 27449827 is a prime.

It is a super-2 number, since 2×31644131² = 2002702053490322, 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 = 31644097 and 31644106.

It is not a weakly prime, because it can be changed into another prime (31644031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15822065 + 15822066.

It is an arithmetic number, because the mean of its divisors is an integer number (15822066).

Almost surely, 2^31644131 is an apocalyptic number.

31644131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31644131 is an equidigital number, since it uses as much as digits as its factorization.

31644131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 31644131 is about 5625.3116358118. The cubic root of 31644131 is about 316.2989313280.

Adding to 31644131 its reverse (13144613), we get a palindrome (44788744).

The spelling of 31644131 in words is "thirty-one million, six hundred forty-four thousand, one hundred thirty-one".