30998987 has 2 divisors, whose sum is σ = 30998988. Its totient is φ = 30998986.

The previous prime is 30998909. The next prime is 30999029. The reversal of 30998987 is 78989903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30998987 - 2¹² = 30994891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30992987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15499493 + 15499494.

It is an arithmetic number, because the mean of its divisors is an integer number (15499494).

Almost surely, 2^30998987 is an apocalyptic number.

30998987 is a deficient number, since it is larger than the sum of its proper divisors (1).

30998987 is an equidigital number, since it uses as much as digits as its factorization.

30998987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 30998987 is about 5567.6733920014. The cubic root of 30998987 is about 314.1346434614.

The spelling of 30998987 in words is "thirty million, nine hundred ninety-eight thousand, nine hundred eighty-seven".