31326409 has 9 divisors (see below), whose sum is σ = 32612853. Its totient is φ = 30089472.

The previous prime is 31326401. The next prime is 31326413. The reversal of 31326409 is 90462313.

The square root of 31326409 is 5597.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1863225 + 29463184 = 1365^2 + 5428^2 .

It is not a de Polignac number, because 31326409 - 2³ = 31326401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31326401) 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 in 8 ways as a sum of consecutive naturals, for example, 162217 + ... + 162409.

Almost surely, 2^31326409 is an apocalyptic number.

31326409 is the 5597-th square number.

31326409 is the 2799-th centered octagonal number.

It is an amenable number.

31326409 is a deficient number, since it is larger than the sum of its proper divisors (1286444).

31326409 is an frugal number, since it uses more digits than its factorization.

31326409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The cubic root of 31326409 is about 315.2367716780.

The spelling of 31326409 in words is "thirty-one million, three hundred twenty-six thousand, four hundred nine".