91766791 has 2 divisors, whose sum is σ = 91766792. Its totient is φ = 91766790.

The previous prime is 91766699. The next prime is 91766809. The reversal of 91766791 is 19766719.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91766791 is a prime.

It is a super-2 number, since 2×91766791² = 16842287860875362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91766491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45883395 + 45883396.

It is an arithmetic number, because the mean of its divisors is an integer number (45883396).

Almost surely, 2^91766791 is an apocalyptic number.

91766791 is a deficient number, since it is larger than the sum of its proper divisors (1).

91766791 is an equidigital number, since it uses as much as digits as its factorization.

91766791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 46.

The square root of 91766791 is about 9579.4984733022. The cubic root of 91766791 is about 451.0539755754.

The spelling of 91766791 in words is "ninety-one million, seven hundred sixty-six thousand, seven hundred ninety-one".