91566503 has 4 divisors (see below), whose sum is σ = 104647440. Its totient is φ = 78485568.

The previous prime is 91566469. The next prime is 91566509. The reversal of 91566503 is 30566519.

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

It is not a de Polignac number, because 91566503 - 2¹⁴ = 91550119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91566509) 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, 6540458 + ... + 6540471.

It is an arithmetic number, because the mean of its divisors is an integer number (26161860).

Almost surely, 2^91566503 is an apocalyptic number.

91566503 is a deficient number, since it is larger than the sum of its proper divisors (13080937).

91566503 is a wasteful number, since it uses less digits than its factorization.

91566503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13080936.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 91566503 is about 9569.0387709529. The cubic root of 91566503 is about 450.7255833447.

The spelling of 91566503 in words is "ninety-one million, five hundred sixty-six thousand, five hundred three".