101998999 has 2 divisors, whose sum is σ = 101999000. Its totient is φ = 101998998.

The previous prime is 101998987. The next prime is 101999017. The reversal of 101998999 is 999899101.

It is a weak prime.

It is an emirp because it is prime and its reverse (999899101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101998999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101998969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50999499 + 50999500.

It is an arithmetic number, because the mean of its divisors is an integer number (50999500).

Almost surely, 2^101998999 is an apocalyptic number.

101998999 is a deficient number, since it is larger than the sum of its proper divisors (1).

101998999 is an equidigital number, since it uses as much as digits as its factorization.

101998999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 55.

The square root of 101998999 is about 10099.4553813560. The cubic root of 101998999 is about 467.2313443988.

The spelling of 101998999 in words is "one hundred one million, nine hundred ninety-eight thousand, nine hundred ninety-nine".