199218953 has 2 divisors, whose sum is σ = 199218954. Its totient is φ = 199218952.

The previous prime is 199218949. The next prime is 199218983. The reversal of 199218953 is 359812991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137077264 + 62141689 = 11708^2 + 7883^2 .

It is an emirp because it is prime and its reverse (359812991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199218953 - 2² = 199218949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199218898 and 199218907.

It is not a weakly prime, because it can be changed into another prime (199218923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99609476 + 99609477.

It is an arithmetic number, because the mean of its divisors is an integer number (99609477).

Almost surely, 2^199218953 is an apocalyptic number.

It is an amenable number.

199218953 is a deficient number, since it is larger than the sum of its proper divisors (1).

199218953 is an equidigital number, since it uses as much as digits as its factorization.

199218953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 47.

The square root of 199218953 is about 14114.4944294863. The cubic root of 199218953 is about 584.0412894198.

The spelling of 199218953 in words is "one hundred ninety-nine million, two hundred eighteen thousand, nine hundred fifty-three".