91923661 has 4 divisors (see below), whose sum is σ = 92000412. Its totient is φ = 91846912.

The previous prime is 91923659. The next prime is 91923673. The reversal of 91923661 is 16632919.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46158436 + 45765225 = 6794^2 + 6765^2 .

It is a cyclic number.

It is not a de Polignac number, because 91923661 - 2¹ = 91923659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91923661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91923761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36550 + ... + 38983.

It is an arithmetic number, because the mean of its divisors is an integer number (23000103).

Almost surely, 2^91923661 is an apocalyptic number.

It is an amenable number.

91923661 is a deficient number, since it is larger than the sum of its proper divisors (76751).

91923661 is a wasteful number, since it uses less digits than its factorization.

91923661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76750.

The product of its digits is 17496, while the sum is 37.

The square root of 91923661 is about 9587.6827753112. The cubic root of 91923661 is about 451.3108461216.

The spelling of 91923661 in words is "ninety-one million, nine hundred twenty-three thousand, six hundred sixty-one".