1089360891 has 24 divisors (see below), whose sum is σ = 1643516160. Its totient is φ = 693996336.

The previous prime is 1089360889. The next prime is 1089360907. The reversal of 1089360891 is 1980639801.

It is not a de Polignac number, because 1089360891 - 2¹ = 1089360889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1089360871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 300210 + ... + 303816.

It is an arithmetic number, because the mean of its divisors is an integer number (68479840).

Almost surely, 2^1089360891 is an apocalyptic number.

1089360891 is a deficient number, since it is larger than the sum of its proper divisors (554155269).

1089360891 is a wasteful number, since it uses less digits than its factorization.

1089360891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095 (or 5092 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1089360891 is about 33005.4675925065. The cubic root of 1089360891 is about 1028.9412852852.

The spelling of 1089360891 in words is "one billion, eighty-nine million, three hundred sixty thousand, eight hundred ninety-one".