31118869 has 2 divisors, whose sum is σ = 31118870. Its totient is φ = 31118868.

The previous prime is 31118863. The next prime is 31118909. The reversal of 31118869 is 96881113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23882769 + 7236100 = 4887^2 + 2690^2 .

It is a cyclic number.

It is not a de Polignac number, because 31118869 - 2⁵ = 31118837 is a prime.

It is a super-2 number, since 2×31118869² = 1936768015678322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31118863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15559434 + 15559435.

It is an arithmetic number, because the mean of its divisors is an integer number (15559435).

Almost surely, 2^31118869 is an apocalyptic number.

It is an amenable number.

31118869 is a deficient number, since it is larger than the sum of its proper divisors (1).

31118869 is an equidigital number, since it uses as much as digits as its factorization.

31118869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 37.

The square root of 31118869 is about 5578.4289006852. The cubic root of 31118869 is about 314.5390722382.

The spelling of 31118869 in words is "thirty-one million, one hundred eighteen thousand, eight hundred sixty-nine".