7227991 has 4 divisors (see below), whose sum is σ = 7461184. Its totient is φ = 6994800.

The previous prime is 7227977. The next prime is 7228021. The reversal of 7227991 is 1997227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1997227 = 881 ⋅2267.

It is a cyclic number.

It is not a de Polignac number, because 7227991 - 2¹¹ = 7225943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7227991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7227971) 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, 116550 + ... + 116611.

It is an arithmetic number, because the mean of its divisors is an integer number (1865296).

Almost surely, 2^7227991 is an apocalyptic number.

7227991 is a deficient number, since it is larger than the sum of its proper divisors (233193).

7227991 is a wasteful number, since it uses less digits than its factorization.

7227991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233192.

The product of its digits is 15876, while the sum is 37.

The square root of 7227991 is about 2688.4923284250. The cubic root of 7227991 is about 193.3477849549.

The spelling of 7227991 in words is "seven million, two hundred twenty-seven thousand, nine hundred ninety-one".