91661763 has 4 divisors (see below), whose sum is σ = 122215688. Its totient is φ = 61107840.

The previous prime is 91661753. The next prime is 91661771. The reversal of 91661763 is 36716619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36716619 = 3 ⋅12238873.

It is not a de Polignac number, because 91661763 - 2⁴ = 91661747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91661753) 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, 15276958 + ... + 15276963.

It is an arithmetic number, because the mean of its divisors is an integer number (30553922).

Almost surely, 2^91661763 is an apocalyptic number.

91661763 is a deficient number, since it is larger than the sum of its proper divisors (30553925).

91661763 is a wasteful number, since it uses less digits than its factorization.

91661763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30553924.

The product of its digits is 40824, while the sum is 39.

The square root of 91661763 is about 9574.0149884988. The cubic root of 91661763 is about 450.8818313063.

The spelling of 91661763 in words is "ninety-one million, six hundred sixty-one thousand, seven hundred sixty-three".