31361969 has 2 divisors, whose sum is σ = 31361970. Its totient is φ = 31361968.

The previous prime is 31361947. The next prime is 31361971. The reversal of 31361969 is 96916313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31192225 + 169744 = 5585^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 31361969 - 2¹² = 31357873 is a prime.

It is a super-2 number, since 2×31361969² = 1967146199113922, which contains 22 as substring.

Together with 31361971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31364969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15680984 + 15680985.

It is an arithmetic number, because the mean of its divisors is an integer number (15680985).

Almost surely, 2^31361969 is an apocalyptic number.

It is an amenable number.

31361969 is a deficient number, since it is larger than the sum of its proper divisors (1).

31361969 is an equidigital number, since it uses as much as digits as its factorization.

31361969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 31361969 is about 5600.1758008120. The cubic root of 31361969 is about 315.3560063327.

The spelling of 31361969 in words is "thirty-one million, three hundred sixty-one thousand, nine hundred sixty-nine".