100997999 has 2 divisors, whose sum is σ = 100998000. Its totient is φ = 100997998.

The previous prime is 100997993. The next prime is 100998017. The reversal of 100997999 is 999799001.

It is a weak prime.

It is an emirp because it is prime and its reverse (999799001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100997999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100997999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100997993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50498999 + 50499000.

It is an arithmetic number, because the mean of its divisors is an integer number (50499000).

Almost surely, 2^100997999 is an apocalyptic number.

100997999 is a deficient number, since it is larger than the sum of its proper divisors (1).

100997999 is an equidigital number, since it uses as much as digits as its factorization.

100997999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 100997999 is about 10049.7760671569. The cubic root of 100997999 is about 465.6978752894.

The spelling of 100997999 in words is "one hundred million, nine hundred ninety-seven thousand, nine hundred ninety-nine".