30979987 has 2 divisors, whose sum is σ = 30979988. Its totient is φ = 30979986.

The previous prime is 30979981. The next prime is 30979997. The reversal of 30979987 is 78997903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30979987 - 2³ = 30979979 is a prime.

It is not a weakly prime, because it can be changed into another prime (30979981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15489993 + 15489994.

It is an arithmetic number, because the mean of its divisors is an integer number (15489994).

Almost surely, 2^30979987 is an apocalyptic number.

30979987 is a deficient number, since it is larger than the sum of its proper divisors (1).

30979987 is an equidigital number, since it uses as much as digits as its factorization.

30979987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 30979987 is about 5565.9668522189. The cubic root of 30979987 is about 314.0704502018.

The spelling of 30979987 in words is "thirty million, nine hundred seventy-nine thousand, nine hundred eighty-seven".