7122225581 has 4 divisors (see below), whose sum is σ = 7122403392. Its totient is φ = 7122047772.

The previous prime is 7122225577. The next prime is 7122225611. The reversal of 7122225581 is 1855222217.

7122225581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1855222217 = 37 ⋅50141141.

It is a cyclic number.

It is not a de Polignac number, because 7122225581 - 2² = 7122225577 is a prime.

It is a super-2 number, since 2×7122225581² (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 (7122221581) 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, 2510 + ... + 119376.

It is an arithmetic number, because the mean of its divisors is an integer number (1780600848).

Almost surely, 2^7122225581 is an apocalyptic number.

It is an amenable number.

7122225581 is a deficient number, since it is larger than the sum of its proper divisors (177811).

7122225581 is a wasteful number, since it uses less digits than its factorization.

7122225581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177810.

The product of its digits is 22400, while the sum is 35.

The square root of 7122225581 is about 84393.2792407073. The cubic root of 7122225581 is about 1924.0007705307. Note that the first 3 decimals are identical.

Adding to 7122225581 its reverse (1855222217), we get a palindrome (8977447798).

The spelling of 7122225581 in words is "seven billion, one hundred twenty-two million, two hundred twenty-five thousand, five hundred eighty-one".