973221791 has 4 divisors (see below), whose sum is σ = 973411632. Its totient is φ = 973031952.

The previous prime is 973221773. The next prime is 973221811. The reversal of 973221791 is 197122379.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197122379 = 7649 ⋅25771.

It is a cyclic number.

It is not a de Polignac number, because 973221791 - 2²² = 969027487 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 (973221721) 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, 87011 + ... + 97556.

It is an arithmetic number, because the mean of its divisors is an integer number (243352908).

Almost surely, 2^973221791 is an apocalyptic number.

973221791 is a deficient number, since it is larger than the sum of its proper divisors (189841).

973221791 is a wasteful number, since it uses less digits than its factorization.

973221791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189840.

The product of its digits is 47628, while the sum is 41.

The square root of 973221791 is about 31196.5028649046. The cubic root of 973221791 is about 990.9930487256.

The spelling of 973221791 in words is "nine hundred seventy-three million, two hundred twenty-one thousand, seven hundred ninety-one".