199995959 has 2 divisors, whose sum is σ = 199995960.
Its totient is φ = 199995958.
The previous prime is 199995953. The next prime is 199995979. The reversal of 199995959 is 959599991.
It is a weak prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-199995959 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 199995895 and 199995904.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (199995953) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997979 + 99997980.
It is an arithmetic number, because the mean of its divisors is an integer number (99997980).
Almost surely, 2199995959 is an apocalyptic number.
199995959 is a deficient number, since it is larger than the sum of its proper divisors (1).
199995959 is an equidigital number, since it uses as much as digits as its factorization.
199995959 is an evil number, because the sum of its binary digits is even.
The product of its digits is 13286025, while the sum is 65.
The square root of 199995959 is about 14141.9927520841.
The cubic root of 199995959 is about 584.7996089642.
The spelling of 199995959 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, nine hundred fifty-nine".