30979811 has 2 divisors, whose sum is σ = 30979812. Its totient is φ = 30979810.

The previous prime is 30979799. The next prime is 30979843. The reversal of 30979811 is 11897903.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30979811 is a prime.

It is not a weakly prime, because it can be changed into another prime (30975811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15489905 + 15489906.

It is an arithmetic number, because the mean of its divisors is an integer number (15489906).

Almost surely, 2^30979811 is an apocalyptic number.

30979811 is a deficient number, since it is larger than the sum of its proper divisors (1).

30979811 is an equidigital number, since it uses as much as digits as its factorization.

30979811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 30979811 is about 5565.9510418256. The cubic root of 30979811 is about 314.0698554468.

The spelling of 30979811 in words is "thirty million, nine hundred seventy-nine thousand, eight hundred eleven".