1988901089 has 4 divisors (see below), whose sum is σ = 2273029824. Its totient is φ = 1704772356.

The previous prime is 1988901073. The next prime is 1988901139. The reversal of 1988901089 is 9801098891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9801098891 = 12517 ⋅783023.

It is not a de Polignac number, because 1988901089 - 2⁴ = 1988901073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1988901089.

It is not an unprimeable number, because it can be changed into a prime (1988901049) 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, 142064357 + ... + 142064370.

It is an arithmetic number, because the mean of its divisors is an integer number (568257456).

Almost surely, 2^1988901089 is an apocalyptic number.

It is an amenable number.

1988901089 is a deficient number, since it is larger than the sum of its proper divisors (284128735).

1988901089 is an equidigital number, since it uses as much as digits as its factorization.

1988901089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284128734.

The product of its (nonzero) digits is 373248, while the sum is 53.

The square root of 1988901089 is about 44597.0973158568. The cubic root of 1988901089 is about 1257.5861000535.

The spelling of 1988901089 in words is "one billion, nine hundred eighty-eight million, nine hundred one thousand, eighty-nine".