91813073 has 16 divisors (see below), whose sum is σ = 111637440. Its totient is φ = 74419200.

The previous prime is 91813019. The next prime is 91813087. The reversal of 91813073 is 37031819.

It is not a de Polignac number, because 91813073 - 2⁶ = 91813009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91810073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9368 + ... + 16473.

It is an arithmetic number, because the mean of its divisors is an integer number (6977340).

Almost surely, 2^91813073 is an apocalyptic number.

It is an amenable number.

91813073 is a deficient number, since it is larger than the sum of its proper divisors (19824367).

91813073 is a wasteful number, since it uses less digits than its factorization.

91813073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25888.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 91813073 is about 9581.9138484960. The cubic root of 91813073 is about 451.1297915700.

The spelling of 91813073 in words is "ninety-one million, eight hundred thirteen thousand, seventy-three".