1153531539 has 12 divisors (see below), whose sum is σ = 1668154176. Its totient is φ = 768124752.

The previous prime is 1153531531. The next prime is 1153531541. The reversal of 1153531539 is 9351353511.

1153531539 is a `hidden beast` number, since 115 + 3 + 5 + 3 + 1 + 539 = 666.

It is not a de Polignac number, because 1153531539 - 2³ = 1153531531 is a prime.

It is a super-2 number, since 2×1153531539² = 2661270022935417042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1153531531) 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, 66492 + ... + 82025.

It is an arithmetic number, because the mean of its divisors is an integer number (139012848).

Almost surely, 2^1153531539 is an apocalyptic number.

1153531539 is a deficient number, since it is larger than the sum of its proper divisors (514622637).

1153531539 is a wasteful number, since it uses less digits than its factorization.

1153531539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149386 (or 149383 counting only the distinct ones).

The product of its digits is 30375, while the sum is 36.

The square root of 1153531539 is about 33963.6797034715. The cubic root of 1153531539 is about 1048.7609084070.

The spelling of 1153531539 in words is "one billion, one hundred fifty-three million, five hundred thirty-one thousand, five hundred thirty-nine".