31616401 has 2 divisors, whose sum is σ = 31616402. Its totient is φ = 31616400.

The previous prime is 31616393. The next prime is 31616411. The reversal of 31616401 is 10461613.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28462225 + 3154176 = 5335^2 + 1776^2 .

It is a cyclic number.

It is not a de Polignac number, because 31616401 - 2³ = 31616393 is a prime.

It is not a weakly prime, because it can be changed into another prime (31616411) 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, 15808200 + 15808201.

It is an arithmetic number, because the mean of its divisors is an integer number (15808201).

Almost surely, 2^31616401 is an apocalyptic number.

It is an amenable number.

31616401 is a deficient number, since it is larger than the sum of its proper divisors (1).

31616401 is an equidigital number, since it uses as much as digits as its factorization.

31616401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 31616401 is about 5622.8463432678. The cubic root of 31616401 is about 316.2065125828.

The spelling of 31616401 in words is "thirty-one million, six hundred sixteen thousand, four hundred one".