1984979089 has 2 divisors, whose sum is σ = 1984979090. Its totient is φ = 1984979088.

The previous prime is 1984979083. The next prime is 1984979173. The reversal of 1984979089 is 9809794891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1630786689 + 354192400 = 40383^2 + 18820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984979089 - 2⁵ = 1984979057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1984979089.

It is not a weakly prime, because it can be changed into another prime (1984979083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992489544 + 992489545.

It is an arithmetic number, because the mean of its divisors is an integer number (992489545).

Almost surely, 2^1984979089 is an apocalyptic number.

It is an amenable number.

1984979089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984979089 is an equidigital number, since it uses as much as digits as its factorization.

1984979089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11757312, while the sum is 64.

The square root of 1984979089 is about 44553.1041455026. The cubic root of 1984979089 is about 1256.7589266445.

The spelling of 1984979089 in words is "one billion, nine hundred eighty-four million, nine hundred seventy-nine thousand, eighty-nine".