1153891085 has 16 divisors (see below), whose sum is σ = 1439629632. Its totient is φ = 887145600.

The previous prime is 1153891069. The next prime is 1153891087. The reversal of 1153891085 is 5801983511.

It is not a de Polignac number, because 1153891085 - 2⁴ = 1153891069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153891087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28271 + ... + 55740.

It is an arithmetic number, because the mean of its divisors is an integer number (89976852).

Almost surely, 2^1153891085 is an apocalyptic number.

It is an amenable number.

1153891085 is a deficient number, since it is larger than the sum of its proper divisors (285738547).

1153891085 is an equidigital number, since it uses as much as digits as its factorization.

1153891085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84124.

The product of its (nonzero) digits is 43200, while the sum is 41.

The square root of 1153891085 is about 33968.9723865765. The cubic root of 1153891085 is about 1048.8698603823.

The spelling of 1153891085 in words is "one billion, one hundred fifty-three million, eight hundred ninety-one thousand, eighty-five".