7220405581 has 4 divisors (see below), whose sum is σ = 7311803200. Its totient is φ = 7129007964.

The previous prime is 7220405567. The next prime is 7220405603. The reversal of 7220405581 is 1855040227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7220405581 - 2⁹ = 7220405069 is a prime.

It is a super-2 number, since 2×7220405581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220405531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45698691 + ... + 45698848.

It is an arithmetic number, because the mean of its divisors is an integer number (1827950800).

Almost surely, 2^7220405581 is an apocalyptic number.

It is an amenable number.

7220405581 is a deficient number, since it is larger than the sum of its proper divisors (91397619).

7220405581 is an equidigital number, since it uses as much as digits as its factorization.

7220405581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91397618.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 7220405581 is about 84972.9697080195. The cubic root of 7220405581 is about 1932.8012496881.

The spelling of 7220405581 in words is "seven billion, two hundred twenty million, four hundred five thousand, five hundred eighty-one".