91690097 has 2 divisors, whose sum is σ = 91690098. Its totient is φ = 91690096.

The previous prime is 91690073. The next prime is 91690133. The reversal of 91690097 is 79009619.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75881521 + 15808576 = 8711^2 + 3976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91690097 is a prime.

It is not a weakly prime, because it can be changed into another prime (91690057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45845048 + 45845049.

It is an arithmetic number, because the mean of its divisors is an integer number (45845049).

Almost surely, 2^91690097 is an apocalyptic number.

It is an amenable number.

91690097 is a deficient number, since it is larger than the sum of its proper divisors (1).

91690097 is an equidigital number, since it uses as much as digits as its factorization.

91690097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 91690097 is about 9575.4946086351. The cubic root of 91690097 is about 450.9282845901.

The spelling of 91690097 in words is "ninety-one million, six hundred ninety thousand, ninety-seven".