999100889 has 2 divisors, whose sum is σ = 999100890. Its totient is φ = 999100888.

The previous prime is 999100871. The next prime is 999100901. The reversal of 999100889 is 988001999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 919302400 + 79798489 = 30320^2 + 8933^2 .

It is an emirp because it is prime and its reverse (988001999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999100889 - 2²⁸ = 730665433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999100889.

It is not a weakly prime, because it can be changed into another prime (999100589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499550444 + 499550445.

It is an arithmetic number, because the mean of its divisors is an integer number (499550445).

Almost surely, 2^999100889 is an apocalyptic number.

It is an amenable number.

999100889 is a deficient number, since it is larger than the sum of its proper divisors (1).

999100889 is an equidigital number, since it uses as much as digits as its factorization.

999100889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 53.

The square root of 999100889 is about 31608.5572116160. The cubic root of 999100889 is about 999.7002064662.

The spelling of 999100889 in words is "nine hundred ninety-nine million, one hundred thousand, eight hundred eighty-nine".