30990997 has 2 divisors, whose sum is σ = 30990998. Its totient is φ = 30990996.

The previous prime is 30990961. The next prime is 30991007. The reversal of 30990997 is 79909903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24068836 + 6922161 = 4906^2 + 2631^2 .

It is an emirp because it is prime and its reverse (79909903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30990997 - 2²³ = 22602389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30990097) 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, 15495498 + 15495499.

It is an arithmetic number, because the mean of its divisors is an integer number (15495499).

Almost surely, 2^30990997 is an apocalyptic number.

It is an amenable number.

30990997 is a deficient number, since it is larger than the sum of its proper divisors (1).

30990997 is an equidigital number, since it uses as much as digits as its factorization.

30990997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137781, while the sum is 46.

The square root of 30990997 is about 5566.9558108539. The cubic root of 30990997 is about 314.1076517033.

The spelling of 30990997 in words is "thirty million, nine hundred ninety thousand, nine hundred ninety-seven".