1155135231 has 12 divisors (see below), whose sum is σ = 1681668352. Its totient is φ = 764025696.

The previous prime is 1155135173. The next prime is 1155135251. The reversal of 1155135231 is 1325315511.

1155135231 is a `hidden beast` number, since 115 + 513 + 5 + 2 + 31 = 666.

It is not a de Polignac number, because 1155135231 - 2⁹ = 1155134719 is a prime.

It is a super-2 number, since 2×1155135231² = 2668674803794846722, 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 = 1155135195 and 1155135204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155135251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 504166 + ... + 506451.

Almost surely, 2^1155135231 is an apocalyptic number.

1155135231 is a deficient number, since it is larger than the sum of its proper divisors (526533121).

1155135231 is a wasteful number, since it uses less digits than its factorization.

1155135231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010750 (or 1010747 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 1155135231 is about 33987.2804295960. The cubic root of 1155135231 is about 1049.2466950574.

The spelling of 1155135231 in words is "one billion, one hundred fifty-five million, one hundred thirty-five thousand, two hundred thirty-one".