1989816051 has 16 divisors (see below), whose sum is σ = 2810304288. Its totient is φ = 1248000000.

The previous prime is 1989816029. The next prime is 1989816053. The reversal of 1989816051 is 1506189891.

It is not a de Polignac number, because 1989816051 - 2⁵ = 1989816019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1989816053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146551 + ... + 159551.

It is an arithmetic number, because the mean of its divisors is an integer number (175644018).

Almost surely, 2^1989816051 is an apocalyptic number.

1989816051 is a deficient number, since it is larger than the sum of its proper divisors (820488237).

1989816051 is a wasteful number, since it uses less digits than its factorization.

1989816051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16022.

The product of its (nonzero) digits is 155520, while the sum is 48.

The square root of 1989816051 is about 44607.3542255086. The cubic root of 1989816051 is about 1257.7789145847.

The spelling of 1989816051 in words is "one billion, nine hundred eighty-nine million, eight hundred sixteen thousand, fifty-one".