1155222521 has 2 divisors, whose sum is σ = 1155222522. Its totient is φ = 1155222520.

The previous prime is 1155222499. The next prime is 1155222571. The reversal of 1155222521 is 1252225511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1045810921 + 109411600 = 32339^2 + 10460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155222521 - 2¹⁰ = 1155221497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1155222571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577611260 + 577611261.

It is an arithmetic number, because the mean of its divisors is an integer number (577611261).

Almost surely, 2^1155222521 is an apocalyptic number.

It is an amenable number.

1155222521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155222521 is an equidigital number, since it uses as much as digits as its factorization.

1155222521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000, while the sum is 26.

The square root of 1155222521 is about 33988.5645622171. The cubic root of 1155222521 is about 1049.2731238352.

The spelling of 1155222521 in words is "one billion, one hundred fifty-five million, two hundred twenty-two thousand, five hundred twenty-one".