73221591 has 4 divisors (see below), whose sum is σ = 97628792. Its totient is φ = 48814392.

The previous prime is 73221587. The next prime is 73221593. The reversal of 73221591 is 19512237.

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

It is not a de Polignac number, because 73221591 - 2² = 73221587 is a prime.

It is a super-2 number, since 2×73221591² = 10722802777142562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73221593) 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, 12203596 + ... + 12203601.

It is an arithmetic number, because the mean of its divisors is an integer number (24407198).

Almost surely, 2^73221591 is an apocalyptic number.

73221591 is a deficient number, since it is larger than the sum of its proper divisors (24407201).

73221591 is a wasteful number, since it uses less digits than its factorization.

73221591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24407200.

The product of its digits is 3780, while the sum is 30.

The square root of 73221591 is about 8556.9615518594. The cubic root of 73221591 is about 418.3563709935.

The spelling of 73221591 in words is "seventy-three million, two hundred twenty-one thousand, five hundred ninety-one".