91504073173 has 4 divisors (see below), whose sum is σ = 92792863008. Its totient is φ = 90215283340.

The previous prime is 91504073161. The next prime is 91504073239. The reversal of 91504073173 is 37137040519.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91504073173 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 (91504073113) 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, 644394811 + ... + 644394952.

It is an arithmetic number, because the mean of its divisors is an integer number (23198215752).

Almost surely, 2^91504073173 is an apocalyptic number.

It is an amenable number.

91504073173 is a deficient number, since it is larger than the sum of its proper divisors (1288789835).

91504073173 is a wasteful number, since it uses less digits than its factorization.

91504073173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288789834.

The product of its (nonzero) digits is 79380, while the sum is 40.

The spelling of 91504073173 in words is "ninety-one billion, five hundred four million, seventy-three thousand, one hundred seventy-three".