30990811 has 2 divisors, whose sum is σ = 30990812. Its totient is φ = 30990810.

The previous prime is 30990809. The next prime is 30990833. The reversal of 30990811 is 11809903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30990811 - 2¹ = 30990809 is a prime.

Together with 30990809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30990611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15495405 + 15495406.

It is an arithmetic number, because the mean of its divisors is an integer number (15495406).

Almost surely, 2^30990811 is an apocalyptic number.

30990811 is a deficient number, since it is larger than the sum of its proper divisors (1).

30990811 is an equidigital number, since it uses as much as digits as its factorization.

30990811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 30990811 is about 5566.9391051097. The cubic root of 30990811 is about 314.1070233043.

The spelling of 30990811 in words is "thirty million, nine hundred ninety thousand, eight hundred eleven".