31644413 has 2 divisors, whose sum is σ = 31644414. Its totient is φ = 31644412.

The previous prime is 31644401. The next prime is 31644419. The reversal of 31644413 is 31444613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 12652249 = 4358^2 + 3557^2 .

It is a cyclic number.

It is not a de Polignac number, because 31644413 - 2¹⁰ = 31643389 is a prime.

It is a super-2 number, since 2×31644413² = 2002737748229138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31644419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15822206 + 15822207.

It is an arithmetic number, because the mean of its divisors is an integer number (15822207).

Almost surely, 2^31644413 is an apocalyptic number.

It is an amenable number.

31644413 is a deficient number, since it is larger than the sum of its proper divisors (1).

31644413 is an equidigital number, since it uses as much as digits as its factorization.

31644413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 31644413 is about 5625.3367010340. The cubic root of 31644413 is about 316.2998709023.

The spelling of 31644413 in words is "thirty-one million, six hundred forty-four thousand, four hundred thirteen".