1155144291 has 32 divisors (see below), whose sum is σ = 1806271488. Its totient is φ = 642869760.

The previous prime is 1155144257. The next prime is 1155144307. The reversal of 1155144291 is 1924415511.

It is not a de Polignac number, because 1155144291 - 2³⁰ = 81402467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155144091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 943906 + ... + 945128.

It is an arithmetic number, because the mean of its divisors is an integer number (56445984).

Almost surely, 2^1155144291 is an apocalyptic number.

1155144291 is a deficient number, since it is larger than the sum of its proper divisors (651127197).

1155144291 is a wasteful number, since it uses less digits than its factorization.

1155144291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371.

The product of its digits is 7200, while the sum is 33.

The square root of 1155144291 is about 33987.4137144914. The cubic root of 1155144291 is about 1049.2494382139.

It can be divided in two parts, 115514 and 4291, that added together give a triangular number (119805 = T₄₈₉).

The spelling of 1155144291 in words is "one billion, one hundred fifty-five million, one hundred forty-four thousand, two hundred ninety-one".