1989114861 has 4 divisors (see below), whose sum is σ = 2652153152. Its totient is φ = 1326076572.

The previous prime is 1989114859. The next prime is 1989114899. The reversal of 1989114861 is 1684119891.

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.

It is not a de Polignac number, because 1989114861 - 2¹ = 1989114859 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 1989114861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989114811) 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, 331519141 + ... + 331519146.

It is an arithmetic number, because the mean of its divisors is an integer number (663038288).

Almost surely, 2^1989114861 is an apocalyptic number.

It is an amenable number.

1989114861 is a deficient number, since it is larger than the sum of its proper divisors (663038291).

1989114861 is an equidigital number, since it uses as much as digits as its factorization.

1989114861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663038290.

The product of its digits is 124416, while the sum is 48.

The square root of 1989114861 is about 44599.4939545282. The cubic root of 1989114861 is about 1257.6311545924.

The spelling of 1989114861 in words is "one billion, nine hundred eighty-nine million, one hundred fourteen thousand, eight hundred sixty-one".