1155012281 has 2 divisors, whose sum is σ = 1155012282. Its totient is φ = 1155012280.

The previous prime is 1155012151. The next prime is 1155012329. The reversal of 1155012281 is 1822105511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631014400 + 523997881 = 25120^2 + 22891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155012281 - 2³⁰ = 81270457 is a prime.

It is a super-2 number, since 2×1155012281² = 2668106738521645922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1155012281.

It is not a weakly prime, because it can be changed into another prime (1155018281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577506140 + 577506141.

It is an arithmetic number, because the mean of its divisors is an integer number (577506141).

Almost surely, 2^1155012281 is an apocalyptic number.

It is an amenable number.

1155012281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155012281 is an equidigital number, since it uses as much as digits as its factorization.

1155012281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 26.

The square root of 1155012281 is about 33985.4716165599. The cubic root of 1155012281 is about 1049.2094672492.

Adding to 1155012281 its reverse (1822105511), we get a palindrome (2977117792).

The spelling of 1155012281 in words is "one billion, one hundred fifty-five million, twelve thousand, two hundred eighty-one".