199880689 has 2 divisors, whose sum is σ = 199880690. Its totient is φ = 199880688.

The previous prime is 199880687. The next prime is 199880693. The reversal of 199880689 is 986088991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168610225 + 31270464 = 12985^2 + 5592^2 .

It is a cyclic number.

It is not a de Polignac number, because 199880689 - 2¹ = 199880687 is a prime.

It is a super-2 number, since 2×199880689² = 79904579670229442, which contains 22 as substring.

Together with 199880687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199880687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99940344 + 99940345.

It is an arithmetic number, because the mean of its divisors is an integer number (99940345).

Almost surely, 2^199880689 is an apocalyptic number.

It is an amenable number.

199880689 is a deficient number, since it is larger than the sum of its proper divisors (1).

199880689 is an equidigital number, since it uses as much as digits as its factorization.

199880689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 58.

The square root of 199880689 is about 14137.9167135756. The cubic root of 199880689 is about 584.6872353505.

The spelling of 199880689 in words is "one hundred ninety-nine million, eight hundred eighty thousand, six hundred eighty-nine".