31171009 has 4 divisors (see below), whose sum is σ = 31334400. Its totient is φ = 31007620.

The previous prime is 31170991. The next prime is 31171031. The reversal of 31171009 is 90017113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31171009 - 2⁵ = 31170977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31171069) 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 3 ways as a sum of consecutive naturals, for example, 81409 + ... + 81790.

It is an arithmetic number, because the mean of its divisors is an integer number (7833600).

Almost surely, 2^31171009 is an apocalyptic number.

It is an amenable number.

31171009 is a deficient number, since it is larger than the sum of its proper divisors (163391).

31171009 is a wasteful number, since it uses less digits than its factorization.

31171009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163390.

The product of its (nonzero) digits is 189, while the sum is 22.

The square root of 31171009 is about 5583.1003035948. The cubic root of 31171009 is about 314.7146454170.

The spelling of 31171009 in words is "thirty-one million, one hundred seventy-one thousand, nine".