1155775544 has 144 divisors (see below), whose sum is σ = 2825718000. Its totient is φ = 442669920.

The previous prime is 1155775531. The next prime is 1155775561. The reversal of 1155775544 is 4455775511.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 1155775495 and 1155775504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19589387 + ... + 19589445.

Almost surely, 2^1155775544 is an apocalyptic number.

1155775544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1155775544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1412859000).

1155775544 is an abundant number, since it is smaller than the sum of its proper divisors (1669942456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155775544 is an equidigital number, since it uses as much as digits as its factorization.

1155775544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 79 counting only the distinct ones).

The product of its digits is 490000, while the sum is 44.

The square root of 1155775544 is about 33996.6990162280. The cubic root of 1155775544 is about 1049.4405315827.

It can be divided in two parts, 115577 and 5544, that added together give a palindrome (121121).

The spelling of 1155775544 in words is "one billion, one hundred fifty-five million, seven hundred seventy-five thousand, five hundred forty-four".