31161859 has 2 divisors, whose sum is σ = 31161860. Its totient is φ = 31161858.

The previous prime is 31161857. The next prime is 31161869. The reversal of 31161859 is 95816113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31161859 - 2¹ = 31161857 is a prime.

It is a super-2 number, since 2×31161859² = 1942122912671762, which contains 22 as substring.

Together with 31161857, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31161857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15580929 + 15580930.

It is an arithmetic number, because the mean of its divisors is an integer number (15580930).

Almost surely, 2^31161859 is an apocalyptic number.

31161859 is a deficient number, since it is larger than the sum of its proper divisors (1).

31161859 is an equidigital number, since it uses as much as digits as its factorization.

31161859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 31161859 is about 5582.2808062655. The cubic root of 31161859 is about 314.6838484156.

The spelling of 31161859 in words is "thirty-one million, one hundred sixty-one thousand, eight hundred fifty-nine".