31564361 has 2 divisors, whose sum is σ = 31564362. Its totient is φ = 31564360.

The previous prime is 31564333. The next prime is 31564387. The reversal of 31564361 is 16346513.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27237961 + 4326400 = 5219^2 + 2080^2 .

It is an emirp because it is prime and its reverse (16346513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31564361 - 2¹⁸ = 31302217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31564321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15782180 + 15782181.

It is an arithmetic number, because the mean of its divisors is an integer number (15782181).

Almost surely, 2^31564361 is an apocalyptic number.

It is an amenable number.

31564361 is a deficient number, since it is larger than the sum of its proper divisors (1).

31564361 is an equidigital number, since it uses as much as digits as its factorization.

31564361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 31564361 is about 5618.2168879459. The cubic root of 31564361 is about 316.0329273225.

The spelling of 31564361 in words is "thirty-one million, five hundred sixty-four thousand, three hundred sixty-one".