1158553881 has 16 divisors (see below), whose sum is σ = 1738105600. Its totient is φ = 762591024.

The previous prime is 1158553867. The next prime is 1158553897. The reversal of 1158553881 is 1883558511.

1158553881 is a `hidden beast` number, since 1 + 15 + 8 + 553 + 8 + 81 = 666.

It is not a de Polignac number, because 1158553881 - 2⁹ = 1158553369 is a prime.

It is a super-2 number, since 2×1158553881² = 2684494190360324322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1158553801) 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 15 ways as a sum of consecutive naturals, for example, 269446 + ... + 273711.

It is an arithmetic number, because the mean of its divisors is an integer number (108631600).

Almost surely, 2^1158553881 is an apocalyptic number.

It is an amenable number.

1158553881 is a deficient number, since it is larger than the sum of its proper divisors (579551719).

1158553881 is an equidigital number, since it uses as much as digits as its factorization.

1158553881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543245 (or 543239 counting only the distinct ones).

The product of its digits is 192000, while the sum is 45.

The square root of 1158553881 is about 34037.5363532674. The cubic root of 1158553881 is about 1050.2807657340.

The spelling of 1158553881 in words is "one billion, one hundred fifty-eight million, five hundred fifty-three thousand, eight hundred eighty-one".