30786961 has 2 divisors, whose sum is σ = 30786962. Its totient is φ = 30786960.

The previous prime is 30786919. The next prime is 30786979. The reversal of 30786961 is 16968703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24561936 + 6225025 = 4956^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 30786961 - 2¹¹ = 30784913 is a prime.

It is not a weakly prime, because it can be changed into another prime (30786911) 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, 15393480 + 15393481.

It is an arithmetic number, because the mean of its divisors is an integer number (15393481).

Almost surely, 2^30786961 is an apocalyptic number.

It is an amenable number.

30786961 is a deficient number, since it is larger than the sum of its proper divisors (1).

30786961 is an equidigital number, since it uses as much as digits as its factorization.

30786961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 30786961 is about 5548.5999134917. The cubic root of 30786961 is about 313.4168012379.

The spelling of 30786961 in words is "thirty million, seven hundred eighty-six thousand, nine hundred sixty-one".