91873563 has 4 divisors (see below), whose sum is σ = 122498088. Its totient is φ = 61249040.

The previous prime is 91873541. The next prime is 91873577. The reversal of 91873563 is 36537819.

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

It is a cyclic number.

It is not a de Polignac number, because 91873563 - 2²² = 87679259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91873513) 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, 15312258 + ... + 15312263.

It is an arithmetic number, because the mean of its divisors is an integer number (30624522).

Almost surely, 2^91873563 is an apocalyptic number.

91873563 is a deficient number, since it is larger than the sum of its proper divisors (30624525).

91873563 is a wasteful number, since it uses less digits than its factorization.

91873563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30624524.

The product of its digits is 136080, while the sum is 42.

The square root of 91873563 is about 9585.0697963030. The cubic root of 91873563 is about 451.2288437326.

The spelling of 91873563 in words is "ninety-one million, eight hundred seventy-three thousand, five hundred sixty-three".