31490409 has 16 divisors (see below), whose sum is σ = 44791488. Its totient is φ = 19610112.

The previous prime is 31490399. The next prime is 31490447. The reversal of 31490409 is 90409413.

It is not a de Polignac number, because 31490409 - 2⁵ = 31490377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31490479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4734 + ... + 9240.

It is an arithmetic number, because the mean of its divisors is an integer number (2799468).

Almost surely, 2^31490409 is an apocalyptic number.

It is an amenable number.

31490409 is a deficient number, since it is larger than the sum of its proper divisors (13301079).

31490409 is a wasteful number, since it uses less digits than its factorization.

31490409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 31490409 is about 5611.6315809219. The cubic root of 31490409 is about 315.7859236107.

The spelling of 31490409 in words is "thirty-one million, four hundred ninety thousand, four hundred nine".