30990961 has 2 divisors, whose sum is σ = 30990962. Its totient is φ = 30990960.

The previous prime is 30990943. The next prime is 30990997. The reversal of 30990961 is 16909903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30735936 + 255025 = 5544^2 + 505^2 .

It is an emirp because it is prime and its reverse (16909903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30990961 - 2⁷ = 30990833 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30990961.

It is not a weakly prime, because it can be changed into another prime (30990931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15495480 + 15495481.

It is an arithmetic number, because the mean of its divisors is an integer number (15495481).

Almost surely, 2^30990961 is an apocalyptic number.

It is an amenable number.

30990961 is a deficient number, since it is larger than the sum of its proper divisors (1).

30990961 is an equidigital number, since it uses as much as digits as its factorization.

30990961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 30990961 is about 5566.9525774880. The cubic root of 30990961 is about 314.1075300779.

The spelling of 30990961 in words is "thirty million, nine hundred ninety thousand, nine hundred sixty-one".