1155532231 has 16 divisors (see below), whose sum is σ = 1367380800. Its totient is φ = 955438848.

The previous prime is 1155532219. The next prime is 1155532243. The reversal of 1155532231 is 1322355511.

It is an interprime number because it is at equal distance from previous prime (1155532219) and next prime (1155532243).

It is not a de Polignac number, because 1155532231 - 2⁵ = 1155532199 is a prime.

It is a super-2 number, since 2×1155532231² = 2670509473759674722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155532231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155532031) 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, 325675 + ... + 329203.

It is an arithmetic number, because the mean of its divisors is an integer number (85461300).

Almost surely, 2^1155532231 is an apocalyptic number.

1155532231 is a deficient number, since it is larger than the sum of its proper divisors (211848569).

1155532231 is a wasteful number, since it uses less digits than its factorization.

1155532231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178.

The product of its digits is 4500, while the sum is 28.

The square root of 1155532231 is about 33993.1203480940. The cubic root of 1155532231 is about 1049.3668839367.

Adding to 1155532231 its reverse (1322355511), we get a palindrome (2477887742).

The spelling of 1155532231 in words is "one billion, one hundred fifty-five million, five hundred thirty-two thousand, two hundred thirty-one".