31864369 has 2 divisors, whose sum is σ = 31864370. Its totient is φ = 31864368.

The previous prime is 31864367. The next prime is 31864379. The reversal of 31864369 is 96346813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26388769 + 5475600 = 5137^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 31864369 - 2¹ = 31864367 is a prime.

It is a super-2 number, since 2×31864369² = 2030676023536322, which contains 22 as substring.

Together with 31864367, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31864367) 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, 15932184 + 15932185.

It is an arithmetic number, because the mean of its divisors is an integer number (15932185).

Almost surely, 2^31864369 is an apocalyptic number.

It is an amenable number.

31864369 is a deficient number, since it is larger than the sum of its proper divisors (1).

31864369 is an equidigital number, since it uses as much as digits as its factorization.

31864369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 31864369 is about 5644.8533196178. The cubic root of 31864369 is about 317.0310318681.

The spelling of 31864369 in words is "thirty-one million, eight hundred sixty-four thousand, three hundred sixty-nine".