91680697 has 2 divisors, whose sum is σ = 91680698. Its totient is φ = 91680696.

The previous prime is 91680683. The next prime is 91680713. The reversal of 91680697 is 79608619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89321401 + 2359296 = 9451^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 91680697 - 2⁷ = 91680569 is a prime.

It is not a weakly prime, because it can be changed into another prime (91680097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45840348 + 45840349.

It is an arithmetic number, because the mean of its divisors is an integer number (45840349).

Almost surely, 2^91680697 is an apocalyptic number.

It is an amenable number.

91680697 is a deficient number, since it is larger than the sum of its proper divisors (1).

91680697 is an equidigital number, since it uses as much as digits as its factorization.

91680697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 91680697 is about 9575.0037597904. The cubic root of 91680697 is about 450.9128744536.

The spelling of 91680697 in words is "ninety-one million, six hundred eighty thousand, six hundred ninety-seven".