91279961 has 2 divisors, whose sum is σ = 91279962. Its totient is φ = 91279960.

The previous prime is 91279901. The next prime is 91280011. The reversal of 91279961 is 16997219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64705936 + 26574025 = 8044^2 + 5155^2 .

It is a cyclic number.

It is not a de Polignac number, because 91279961 - 2¹⁴ = 91263577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91279901) 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, 45639980 + 45639981.

It is an arithmetic number, because the mean of its divisors is an integer number (45639981).

Almost surely, 2^91279961 is an apocalyptic number.

It is an amenable number.

91279961 is a deficient number, since it is larger than the sum of its proper divisors (1).

91279961 is an equidigital number, since it uses as much as digits as its factorization.

91279961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 44.

The square root of 91279961 is about 9554.0546889789. The cubic root of 91279961 is about 450.2549353813.

The spelling of 91279961 in words is "ninety-one million, two hundred seventy-nine thousand, nine hundred sixty-one".