7225991 has 4 divisors (see below), whose sum is σ = 7231392. Its totient is φ = 7220592.

The previous prime is 7225987. The next prime is 7225997. The reversal of 7225991 is 1995227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7225991 - 2² = 7225987 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 (7225997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 971 + ... + 3923.

It is an arithmetic number, because the mean of its divisors is an integer number (1807848).

Almost surely, 2^7225991 is an apocalyptic number.

7225991 is a deficient number, since it is larger than the sum of its proper divisors (5401).

7225991 is a wasteful number, since it uses less digits than its factorization.

7225991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5400.

The product of its digits is 11340, while the sum is 35.

The square root of 7225991 is about 2688.1203470083. The cubic root of 7225991 is about 193.3299500663.

The spelling of 7225991 in words is "seven million, two hundred twenty-five thousand, nine hundred ninety-one".