31079189 has 4 divisors (see below), whose sum is σ = 31837260. Its totient is φ = 30321120.

The previous prime is 31079183. The next prime is 31079197. The reversal of 31079189 is 98197013.

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 2102500 + 28976689 = 1450^2 + 5383^2 .

It is a cyclic number.

It is not a de Polignac number, because 31079189 - 2⁸ = 31078933 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 (31079183) 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, 378974 + ... + 379055.

It is an arithmetic number, because the mean of its divisors is an integer number (7959315).

Almost surely, 2^31079189 is an apocalyptic number.

It is an amenable number.

31079189 is a deficient number, since it is larger than the sum of its proper divisors (758071).

31079189 is an equidigital number, since it uses as much as digits as its factorization.

31079189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758070.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 31079189 is about 5574.8712092747. The cubic root of 31079189 is about 314.4053246718.

The spelling of 31079189 in words is "thirty-one million, seventy-nine thousand, one hundred eighty-nine".