1155540231 has 12 divisors (see below), whose sum is σ = 1669994560. Its totient is φ = 769953600.

The previous prime is 1155540209. The next prime is 1155540241. The reversal of 1155540231 is 1320455511.

1155540231 is a `hidden beast` number, since 115 + 5 + 540 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 1155540231 - 2⁷ = 1155540103 is a prime.

It is a super-2 number, since 2×1155540231² = 2670546450919066722, 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 = 1155540195 and 1155540204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155540241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15346 + ... + 50463.

Almost surely, 2^1155540231 is an apocalyptic number.

1155540231 is a deficient number, since it is larger than the sum of its proper divisors (514454329).

1155540231 is a wasteful number, since it uses less digits than its factorization.

1155540231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67766 (or 67763 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1155540231 is about 33993.2380187590. The cubic root of 1155540231 is about 1049.3693055958.

Adding to 1155540231 its reverse (1320455511), we get a palindrome (2475995742).

The spelling of 1155540231 in words is "one billion, one hundred fifty-five million, five hundred forty thousand, two hundred thirty-one".