7224557891 has 4 divisors (see below), whose sum is σ = 7604797800. Its totient is φ = 6844317984.

The previous prime is 7224557861. The next prime is 7224557897. The reversal of 7224557891 is 1987554227.

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

It is a cyclic number.

It is not a de Polignac number, because 7224557891 - 2²² = 7220363587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7224557897) 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, 190119926 + ... + 190119963.

It is an arithmetic number, because the mean of its divisors is an integer number (1901199450).

Almost surely, 2^7224557891 is an apocalyptic number.

7224557891 is a deficient number, since it is larger than the sum of its proper divisors (380239909).

7224557891 is a wasteful number, since it uses less digits than its factorization.

7224557891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380239908.

The product of its digits is 1411200, while the sum is 50.

The square root of 7224557891 is about 84997.3993190380. The cubic root of 7224557891 is about 1933.1716837266.

The spelling of 7224557891 in words is "seven billion, two hundred twenty-four million, five hundred fifty-seven thousand, eight hundred ninety-one".