31409109 has 24 divisors (see below), whose sum is σ = 48353760. Its totient is φ = 19589472.

The previous prime is 31409087. The next prime is 31409167. The reversal of 31409109 is 90190413.

It is not a de Polignac number, because 31409109 - 2⁷ = 31408981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31409509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13087 + ... + 15299.

It is an arithmetic number, because the mean of its divisors is an integer number (2014740).

Almost surely, 2^31409109 is an apocalyptic number.

It is an amenable number.

31409109 is a deficient number, since it is larger than the sum of its proper divisors (16944651).

31409109 is a wasteful number, since it uses less digits than its factorization.

31409109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321 (or 2318 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 31409109 is about 5604.3830168895. The cubic root of 31409109 is about 315.5139305166.

The spelling of 31409109 in words is "thirty-one million, four hundred nine thousand, one hundred nine".