31169189 has 2 divisors, whose sum is σ = 31169190. Its totient is φ = 31169188.

The previous prime is 31169153. The next prime is 31169219. The reversal of 31169189 is 98196113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30580900 + 588289 = 5530^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 31169189 - 2²⁰ = 30120613 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31160189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15584594 + 15584595.

It is an arithmetic number, because the mean of its divisors is an integer number (15584595).

Almost surely, 2^31169189 is an apocalyptic number.

It is an amenable number.

31169189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31169189 is an equidigital number, since it uses as much as digits as its factorization.

31169189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 38.

The square root of 31169189 is about 5582.9373093382. The cubic root of 31169189 is about 314.7085201548.

The spelling of 31169189 in words is "thirty-one million, one hundred sixty-nine thousand, one hundred eighty-nine".