1154965861 has 16 divisors (see below), whose sum is σ = 1424851200. Its totient is φ = 914272128.

The previous prime is 1154965849. The next prime is 1154965879. The reversal of 1154965861 is 1685694511.

It is not a de Polignac number, because 1154965861 - 2⁵ = 1154965829 is a prime.

It is a super-2 number, since 2×1154965861² = 2667892280150942642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154965831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119016 + ... + 128353.

It is an arithmetic number, because the mean of its divisors is an integer number (89053200).

Almost surely, 2^1154965861 is an apocalyptic number.

It is an amenable number.

1154965861 is a deficient number, since it is larger than the sum of its proper divisors (269885339).

1154965861 is a wasteful number, since it uses less digits than its factorization.

1154965861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247428.

The product of its digits is 259200, while the sum is 46.

The square root of 1154965861 is about 33984.7886708157. The cubic root of 1154965861 is about 1049.1954111343.

It can be divided in two parts, 115 and 4965861, that added together give a triangular number (4965976 = T₃₁₅₁).

The spelling of 1154965861 in words is "one billion, one hundred fifty-four million, nine hundred sixty-five thousand, eight hundred sixty-one".