1889288891 has 4 divisors (see below), whose sum is σ = 2159187312. Its totient is φ = 1619390472.

The previous prime is 1889288887. The next prime is 1889288899. The reversal of 1889288891 is 1988829881.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1889288891 - 2² = 1889288887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1889288899) 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, 134949200 + ... + 134949213.

It is an arithmetic number, because the mean of its divisors is an integer number (539796828).

Almost surely, 2^1889288891 is an apocalyptic number.

1889288891 is a deficient number, since it is larger than the sum of its proper divisors (269898421).

1889288891 is an equidigital number, since it uses as much as digits as its factorization.

1889288891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269898420.

The product of its digits is 5308416, while the sum is 62.

The square root of 1889288891 is about 43465.9509386370. The cubic root of 1889288891 is about 1236.2305078950.

The spelling of 1889288891 in words is "one billion, eight hundred eighty-nine million, two hundred eighty-eight thousand, eight hundred ninety-one".