91664477 has 2 divisors, whose sum is σ = 91664478. Its totient is φ = 91664476.

The previous prime is 91664473. The next prime is 91664491. The reversal of 91664477 is 77446619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68873401 + 22791076 = 8299^2 + 4774^2 .

It is an emirp because it is prime and its reverse (77446619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91664477 - 2² = 91664473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91664473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45832238 + 45832239.

It is an arithmetic number, because the mean of its divisors is an integer number (45832239).

Almost surely, 2^91664477 is an apocalyptic number.

It is an amenable number.

91664477 is a deficient number, since it is larger than the sum of its proper divisors (1).

91664477 is an equidigital number, since it uses as much as digits as its factorization.

91664477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 44.

The square root of 91664477 is about 9574.1567252683. The cubic root of 91664477 is about 450.8862812942.

The spelling of 91664477 in words is "ninety-one million, six hundred sixty-four thousand, four hundred seventy-seven".