1155214231 has 4 divisors (see below), whose sum is σ = 1216015000. Its totient is φ = 1094413464.

The previous prime is 1155214213. The next prime is 1155214241. The reversal of 1155214231 is 1324125511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1155214231 - 2¹¹ = 1155212183 is a prime.

It is a super-2 number, since 2×1155214231² = 2669039839009842722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1155214196 and 1155214205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155214241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30400356 + ... + 30400393.

It is an arithmetic number, because the mean of its divisors is an integer number (304003750).

Almost surely, 2^1155214231 is an apocalyptic number.

1155214231 is a deficient number, since it is larger than the sum of its proper divisors (60800769).

1155214231 is an equidigital number, since it uses as much as digits as its factorization.

1155214231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60800768.

The product of its digits is 1200, while the sum is 25.

The square root of 1155214231 is about 33988.4426092164. The cubic root of 1155214231 is about 1049.2706139306.

Adding to 1155214231 its reverse (1324125511), we get a palindrome (2479339742).

The spelling of 1155214231 in words is "one billion, one hundred fifty-five million, two hundred fourteen thousand, two hundred thirty-one".