1989865499 has 2 divisors, whose sum is σ = 1989865500. Its totient is φ = 1989865498.

The previous prime is 1989865399. The next prime is 1989865531. The reversal of 1989865499 is 9945689891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1989865499 - 2⁸ = 1989865243 is a prime.

It is a super-2 number, since 2×1989865499² = 7919129408221038002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1989865399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994932749 + 994932750.

It is an arithmetic number, because the mean of its divisors is an integer number (994932750).

Almost surely, 2^1989865499 is an apocalyptic number.

1989865499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989865499 is an equidigital number, since it uses as much as digits as its factorization.

1989865499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50388480, while the sum is 68.

The square root of 1989865499 is about 44607.9084804477. The cubic root of 1989865499 is about 1257.7893333261.

The spelling of 1989865499 in words is "one billion, nine hundred eighty-nine million, eight hundred sixty-five thousand, four hundred ninety-nine".