1155131227 has 2 divisors, whose sum is σ = 1155131228. Its totient is φ = 1155131226.

The previous prime is 1155131209. The next prime is 1155131251. The reversal of 1155131227 is 7221315511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155131227 - 2⁷ = 1155131099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1155131195 and 1155131204.

It is not a weakly prime, because it can be changed into another prime (1155137227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577565613 + 577565614.

It is an arithmetic number, because the mean of its divisors is an integer number (577565614).

Almost surely, 2^1155131227 is an apocalyptic number.

1155131227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155131227 is an equidigital number, since it uses as much as digits as its factorization.

1155131227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 28.

The square root of 1155131227 is about 33987.2215251556. The cubic root of 1155131227 is about 1049.2454827351.

Adding to 1155131227 its reverse (7221315511), we get a palindrome (8376446738).

It can be divided in two parts, 11551 and 31227, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 1155131227 in words is "one billion, one hundred fifty-five million, one hundred thirty-one thousand, two hundred twenty-seven".