1155438755 has 4 divisors (see below), whose sum is σ = 1386526512. Its totient is φ = 924351000.

The previous prime is 1155438749. The next prime is 1155438829. The reversal of 1155438755 is 5578345511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5578345511 = 59 ⋅94548229.

It is not a de Polignac number, because 1155438755 - 2²⁰ = 1154390179 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115543871 + ... + 115543880.

It is an arithmetic number, because the mean of its divisors is an integer number (346631628).

Almost surely, 2^1155438755 is an apocalyptic number.

1155438755 is a deficient number, since it is larger than the sum of its proper divisors (231087757).

1155438755 is an equidigital number, since it uses as much as digits as its factorization.

1155438755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231087756.

The product of its digits is 420000, while the sum is 44.

The square root of 1155438755 is about 33991.7453950220. The cubic root of 1155438755 is about 1049.3385872317.

The spelling of 1155438755 in words is "one billion, one hundred fifty-five million, four hundred thirty-eight thousand, seven hundred fifty-five".