31045909 has 4 divisors (see below), whose sum is σ = 31129516. Its totient is φ = 30962304.

The previous prime is 31045879. The next prime is 31045919. The reversal of 31045909 is 90954013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25654225 + 5391684 = 5065^2 + 2322^2 .

It is a cyclic number.

It is not a de Polignac number, because 31045909 - 2⁵ = 31045877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31045919) 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, 41244 + ... + 41989.

It is an arithmetic number, because the mean of its divisors is an integer number (7782379).

Almost surely, 2^31045909 is an apocalyptic number.

It is an amenable number.

31045909 is a deficient number, since it is larger than the sum of its proper divisors (83607).

31045909 is an equidigital number, since it uses as much as digits as its factorization.

31045909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83606.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 31045909 is about 5571.8855874829. The cubic root of 31045909 is about 314.2930614870.

The spelling of 31045909 in words is "thirty-one million, forty-five thousand, nine hundred nine".