31161959 has 2 divisors, whose sum is σ = 31161960. Its totient is φ = 31161958.

The previous prime is 31161917. The next prime is 31161961. The reversal of 31161959 is 95916113.

It is a strong prime.

It is an emirp because it is prime and its reverse (95916113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31161959 - 2⁸ = 31161703 is a prime.

Together with 31161961, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31161989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15580979 + 15580980.

It is an arithmetic number, because the mean of its divisors is an integer number (15580980).

Almost surely, 2^31161959 is an apocalyptic number.

31161959 is a deficient number, since it is larger than the sum of its proper divisors (1).

31161959 is an equidigital number, since it uses as much as digits as its factorization.

31161959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7290, while the sum is 35.

The square root of 31161959 is about 5582.2897631707. The cubic root of 31161959 is about 314.6841850275.

The spelling of 31161959 in words is "thirty-one million, one hundred sixty-one thousand, nine hundred fifty-nine".