1988099999 has 2 divisors, whose sum is σ = 1988100000. Its totient is φ = 1988099998.

The previous prime is 1988099987. The next prime is 1988100011. The reversal of 1988099999 is 9999908891.

It is a balanced prime because it is at equal distance from previous prime (1988099987) and next prime (1988100011).

It is a cyclic number.

It is not a de Polignac number, because 1988099999 - 2¹² = 1988095903 is a prime.

1988099999 is a modest number, since divided by 99999 gives 19880 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988099909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994049999 + 994050000.

It is an arithmetic number, because the mean of its divisors is an integer number (994050000).

Almost surely, 2^1988099999 is an apocalyptic number.

1988099999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988099999 is an equidigital number, since it uses as much as digits as its factorization.

1988099999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34012224, while the sum is 71.

The square root of 1988099999 is about 44588.1149971604. The cubic root of 1988099999 is about 1257.4172337813.

The spelling of 1988099999 in words is "one billion, nine hundred eighty-eight million, ninety-nine thousand, nine hundred ninety-nine".