31356401 has 4 divisors (see below), whose sum is σ = 31368612. Its totient is φ = 31344192.

The previous prime is 31356389. The next prime is 31356419. The reversal of 31356401 is 10465313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10465313 = 149 ⋅70237.

It can be written as a sum of positive squares in 2 ways, for example, as 14258176 + 17098225 = 3776^2 + 4135^2 .

It is a cyclic number.

It is not a de Polignac number, because 31356401 - 2²² = 27162097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31356461) 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 in 3 ways as a sum of consecutive naturals, for example, 596 + ... + 7941.

It is an arithmetic number, because the mean of its divisors is an integer number (7842153).

Almost surely, 2^31356401 is an apocalyptic number.

It is an amenable number.

31356401 is a deficient number, since it is larger than the sum of its proper divisors (12211).

31356401 is an equidigital number, since it uses as much as digits as its factorization.

31356401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12210.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 31356401 is about 5599.6786514942. The cubic root of 31356401 is about 315.3373424730.

The spelling of 31356401 in words is "thirty-one million, three hundred fifty-six thousand, four hundred one".