31199089 has 2 divisors, whose sum is σ = 31199090. Its totient is φ = 31199088.

The previous prime is 31199081. The next prime is 31199111. The reversal of 31199089 is 98099113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21464689 + 9734400 = 4633^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 31199089 - 2³ = 31199081 is a prime.

It is not a weakly prime, because it can be changed into another prime (31199081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15599544 + 15599545.

It is an arithmetic number, because the mean of its divisors is an integer number (15599545).

Almost surely, 2^31199089 is an apocalyptic number.

It is an amenable number.

31199089 is a deficient number, since it is larger than the sum of its proper divisors (1).

31199089 is an equidigital number, since it uses as much as digits as its factorization.

31199089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 31199089 is about 5585.6144693310. The cubic root of 31199089 is about 314.8091192591.

The spelling of 31199089 in words is "thirty-one million, one hundred ninety-nine thousand, eighty-nine".