91697761 has 2 divisors, whose sum is σ = 91697762. Its totient is φ = 91697760.

The previous prime is 91697747. The next prime is 91697777. The reversal of 91697761 is 16779619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53949025 + 37748736 = 7345^2 + 6144^2 .

It is a cyclic number.

It is not a de Polignac number, because 91697761 - 2⁷ = 91697633 is a prime.

It is not a weakly prime, because it can be changed into another prime (91697161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45848880 + 45848881.

It is an arithmetic number, because the mean of its divisors is an integer number (45848881).

Almost surely, 2^91697761 is an apocalyptic number.

It is an amenable number.

91697761 is a deficient number, since it is larger than the sum of its proper divisors (1).

91697761 is an equidigital number, since it uses as much as digits as its factorization.

91697761 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 91697761 is about 9575.8947884780. The cubic root of 91697761 is about 450.9408479901.

The spelling of 91697761 in words is "ninety-one million, six hundred ninety-seven thousand, seven hundred sixty-one".