1155140231 has 12 divisors (see below), whose sum is σ = 1329258672. Its totient is φ = 983342784.

The previous prime is 1155140227. The next prime is 1155140237. The reversal of 1155140231 is 1320415511.

It is not a de Polignac number, because 1155140231 - 2² = 1155140227 is a prime.

It is a super-2 number, since 2×1155140231² = 2668697906549466722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1155140197 and 1155140206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155140237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151691 + ... + 159123.

It is an arithmetic number, because the mean of its divisors is an integer number (110771556).

Almost surely, 2^1155140231 is an apocalyptic number.

1155140231 is a deficient number, since it is larger than the sum of its proper divisors (174118441).

1155140231 is an frugal number, since it uses more digits than its factorization.

1155140231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7738 (or 7589 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1155140231 is about 33987.3539864462. The cubic root of 1155140231 is about 1049.2482089424.

Adding to 1155140231 its reverse (1320415511), we get a palindrome (2475555742).

The spelling of 1155140231 in words is "one billion, one hundred fifty-five million, one hundred forty thousand, two hundred thirty-one".