7225557121 has 2 divisors, whose sum is σ = 7225557122. Its totient is φ = 7225557120.

The previous prime is 7225557113. The next prime is 7225557137. The reversal of 7225557121 is 1217555227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4440356496 + 2785200625 = 66636^2 + 52775^2 .

It is a cyclic number.

It is not a de Polignac number, because 7225557121 - 2³ = 7225557113 is a prime.

It is not a weakly prime, because it can be changed into another prime (7225557161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3612778560 + 3612778561.

It is an arithmetic number, because the mean of its divisors is an integer number (3612778561).

Almost surely, 2^7225557121 is an apocalyptic number.

It is an amenable number.

7225557121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7225557121 is an equidigital number, since it uses as much as digits as its factorization.

7225557121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49000, while the sum is 37.

The square root of 7225557121 is about 85003.2771191794. The cubic root of 7225557121 is about 1933.2608054011.

The spelling of 7225557121 in words is "seven billion, two hundred twenty-five million, five hundred fifty-seven thousand, one hundred twenty-one".