7221791 has 4 divisors (see below), whose sum is σ = 7454784. Its totient is φ = 6988800.

The previous prime is 7221779. The next prime is 7221811. The reversal of 7221791 is 1971227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1971227 = 47 ⋅41941.

It is a cyclic number.

It is not a de Polignac number, because 7221791 - 2²² = 3027487 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 (7221391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116450 + ... + 116511.

It is an arithmetic number, because the mean of its divisors is an integer number (1863696).

Almost surely, 2^7221791 is an apocalyptic number.

7221791 is a deficient number, since it is larger than the sum of its proper divisors (232993).

7221791 is a wasteful number, since it uses less digits than its factorization.

7221791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232992.

The product of its digits is 1764, while the sum is 29.

The square root of 7221791 is about 2687.3390184344. The cubic root of 7221791 is about 193.2924860857.

The spelling of 7221791 in words is "seven million, two hundred twenty-one thousand, seven hundred ninety-one".