31096409 has 4 divisors (see below), whose sum is σ = 31854900. Its totient is φ = 30337920.

The previous prime is 31096309. The next prime is 31096423. The reversal of 31096409 is 90469013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90469013 = 19 ⋅4761527.

It can be written as a sum of positive squares in 2 ways, for example, as 6375625 + 24720784 = 2525^2 + 4972^2 .

It is a cyclic number.

It is not a de Polignac number, because 31096409 - 2²⁰ = 30047833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31096459) 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, 379184 + ... + 379265.

It is an arithmetic number, because the mean of its divisors is an integer number (7963725).

Almost surely, 2^31096409 is an apocalyptic number.

It is an amenable number.

31096409 is a deficient number, since it is larger than the sum of its proper divisors (758491).

31096409 is an equidigital number, since it uses as much as digits as its factorization.

31096409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758490.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 31096409 is about 5576.4154257014. The cubic root of 31096409 is about 314.4633813141.

The spelling of 31096409 in words is "thirty-one million, ninety-six thousand, four hundred nine".