30998809 has 2 divisors, whose sum is σ = 30998810. Its totient is φ = 30998808.

The previous prime is 30998801. The next prime is 30998831. The reversal of 30998809 is 90889903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30969225 + 29584 = 5565^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 30998809 - 2³ = 30998801 is a prime.

It is not a weakly prime, because it can be changed into another prime (30998801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15499404 + 15499405.

It is an arithmetic number, because the mean of its divisors is an integer number (15499405).

Almost surely, 2^30998809 is an apocalyptic number.

It is an amenable number.

30998809 is a deficient number, since it is larger than the sum of its proper divisors (1).

30998809 is an equidigital number, since it uses as much as digits as its factorization.

30998809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 30998809 is about 5567.6574068454. The cubic root of 30998809 is about 314.1340421937.

The spelling of 30998809 in words is "thirty million, nine hundred ninety-eight thousand, eight hundred nine".