31345809 has 16 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 18943760.

The previous prime is 31345799. The next prime is 31345813. The reversal of 31345809 is 90854313.

It is not a de Polignac number, because 31345809 - 2⁴ = 31345793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31345809.

It is not an unprimeable number, because it can be changed into a prime (31345829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12694 + ... + 14960.

It is an arithmetic number, because the mean of its divisors is an integer number (2857680).

Almost surely, 2^31345809 is an apocalyptic number.

It is an amenable number.

31345809 is a deficient number, since it is larger than the sum of its proper divisors (14377071).

31345809 is a wasteful number, since it uses less digits than its factorization.

31345809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 31345809 is about 5598.7328030546. The cubic root of 31345809 is about 315.3018321341.

The spelling of 31345809 in words is "thirty-one million, three hundred forty-five thousand, eight hundred nine".