888799921 has 2 divisors, whose sum is σ = 888799922. Its totient is φ = 888799920.

The previous prime is 888799913. The next prime is 888799937. The reversal of 888799921 is 129997888.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524410000 + 364389921 = 22900^2 + 19089^2 .

It is a cyclic number.

It is not a de Polignac number, because 888799921 - 2³ = 888799913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 888799921.

It is not a weakly prime, because it can be changed into another prime (888796921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 444399960 + 444399961.

It is an arithmetic number, because the mean of its divisors is an integer number (444399961).

Almost surely, 2^888799921 is an apocalyptic number.

It is an amenable number.

888799921 is a deficient number, since it is larger than the sum of its proper divisors (1).

888799921 is an equidigital number, since it uses as much as digits as its factorization.

888799921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 61.

The square root of 888799921 is about 29812.7476258060. The cubic root of 888799921 is about 961.4676339931.

The spelling of 888799921 in words is "eight hundred eighty-eight million, seven hundred ninety-nine thousand, nine hundred twenty-one".