91573417321 has 27 divisors (see below), whose sum is σ = 97816615869. Its totient is φ = 85721223192.

The previous prime is 91573417297. The next prime is 91573417337. The reversal of 91573417321 is 12371437519.

The square root of 91573417321 is 302611.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 91573417321 - 2¹¹ = 91573415273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91573417361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 410643016 + ... + 410643238.

Almost surely, 2^91573417321 is an apocalyptic number.

91573417321 is the 302611-st square number.

91573417321 is the 151306-th centered octagonal number.

It is an amenable number.

91573417321 is a deficient number, since it is larger than the sum of its proper divisors (6243198548).

91573417321 is an frugal number, since it uses more digits than its factorization.

91573417321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 305 counting only the distinct ones).

The product of its digits is 158760, while the sum is 43.

The spelling of 91573417321 in words is "ninety-one billion, five hundred seventy-three million, four hundred seventeen thousand, three hundred twenty-one".