1155531223 has 8 divisors (see below), whose sum is σ = 1440662400. Its totient is φ = 900413880.

The previous prime is 1155531211. The next prime is 1155531239. The reversal of 1155531223 is 3221355511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155531223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1155531191 and 1155531200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155531323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7503373 + ... + 7503526.

It is an arithmetic number, because the mean of its divisors is an integer number (180082800).

Almost surely, 2^1155531223 is an apocalyptic number.

1155531223 is a deficient number, since it is larger than the sum of its proper divisors (285131177).

1155531223 is a wasteful number, since it uses less digits than its factorization.

1155531223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15006917.

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

The square root of 1155531223 is about 33993.1055215613. The cubic root of 1155531223 is about 1049.3665788068.

Adding to 1155531223 its reverse (3221355511), we get a palindrome (4376886734).

It can be divided in two parts, 11555 and 31223, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 1155531223 in words is "one billion, one hundred fifty-five million, five hundred thirty-one thousand, two hundred twenty-three".