91566977 has 2 divisors, whose sum is σ = 91566978. Its totient is φ = 91566976.

The previous prime is 91566967. The next prime is 91566983. The reversal of 91566977 is 77966519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 22743361 = 8296^2 + 4769^2 .

It is a cyclic number.

It is not a de Polignac number, because 91566977 - 2⁴ = 91566961 is a prime.

It is a super-2 number, since 2×91566977² = 16769022553837058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91566967) 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, 45783488 + 45783489.

It is an arithmetic number, because the mean of its divisors is an integer number (45783489).

Almost surely, 2^91566977 is an apocalyptic number.

It is an amenable number.

91566977 is a deficient number, since it is larger than the sum of its proper divisors (1).

91566977 is an equidigital number, since it uses as much as digits as its factorization.

91566977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 50.

The square root of 91566977 is about 9569.0635382988. The cubic root of 91566977 is about 450.7263610802.

The spelling of 91566977 in words is "ninety-one million, five hundred sixty-six thousand, nine hundred seventy-seven".