1089250391 has 4 divisors (see below), whose sum is σ = 1089349800. Its totient is φ = 1089150984.

The previous prime is 1089250381. The next prime is 1089250439. The reversal of 1089250391 is 1930529801.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089250391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089250361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30896 + ... + 55973.

It is an arithmetic number, because the mean of its divisors is an integer number (272337450).

Almost surely, 2^1089250391 is an apocalyptic number.

1089250391 is a deficient number, since it is larger than the sum of its proper divisors (99409).

1089250391 is an equidigital number, since it uses as much as digits as its factorization.

1089250391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99408.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1089250391 is about 33003.7935849805. The cubic root of 1089250391 is about 1028.9064936756.

The spelling of 1089250391 in words is "one billion, eighty-nine million, two hundred fifty thousand, three hundred ninety-one".