1155169281 has 16 divisors (see below), whose sum is σ = 1775839104. Its totient is φ = 654253824.

The previous prime is 1155169271. The next prime is 1155169283. The reversal of 1155169281 is 1829615511.

It is a happy number.

It is not a de Polignac number, because 1155169281 - 2⁹ = 1155168769 is a prime.

It is a super-2 number, since 2×1155169281² = 2668832135532113922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155169283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241026 + ... + 245771.

It is an arithmetic number, because the mean of its divisors is an integer number (110989944).

Almost surely, 2^1155169281 is an apocalyptic number.

It is an amenable number.

1155169281 is a deficient number, since it is larger than the sum of its proper divisors (620669823).

1155169281 is a wasteful number, since it uses less digits than its factorization.

1155169281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486920.

The product of its digits is 21600, while the sum is 39.

The square root of 1155169281 is about 33987.7813485964. The cubic root of 1155169281 is about 1049.2570045282.

The spelling of 1155169281 in words is "one billion, one hundred fifty-five million, one hundred sixty-nine thousand, two hundred eighty-one".