31296409 has 4 divisors (see below), whose sum is σ = 31317604. Its totient is φ = 31275216.

The previous prime is 31296383. The next prime is 31296427. The reversal of 31296409 is 90469213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90469213 = 7369 ⋅12277.

It can be written as a sum of positive squares in 2 ways, for example, as 9018009 + 22278400 = 3003^2 + 4720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31296409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31296449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8202 + ... + 11395.

It is an arithmetic number, because the mean of its divisors is an integer number (7829401).

Almost surely, 2^31296409 is an apocalyptic number.

It is an amenable number.

31296409 is a deficient number, since it is larger than the sum of its proper divisors (21195).

31296409 is a wasteful number, since it uses less digits than its factorization.

31296409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21194.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 31296409 is about 5594.3193509130. The cubic root of 31296409 is about 315.1361098195.

It can be divided in two parts, 312 and 96409, that added together give a square (96721 = 311²).

The spelling of 31296409 in words is "thirty-one million, two hundred ninety-six thousand, four hundred nine".