199995953 has 2 divisors, whose sum is σ = 199995954. Its totient is φ = 199995952.

The previous prime is 199995949. The next prime is 199995959. The reversal of 199995953 is 359599991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181090849 + 18905104 = 13457^2 + 4348^2 .

It is an emirp because it is prime and its reverse (359599991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199995953 - 2² = 199995949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199995892 and 199995901.

It is not a weakly prime, because it can be changed into another prime (199995959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997976 + 99997977.

It is an arithmetic number, because the mean of its divisors is an integer number (99997977).

Almost surely, 2^199995953 is an apocalyptic number.

It is an amenable number.

199995953 is a deficient number, since it is larger than the sum of its proper divisors (1).

199995953 is an equidigital number, since it uses as much as digits as its factorization.

199995953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4428675, while the sum is 59.

The square root of 199995953 is about 14141.9925399499. The cubic root of 199995953 is about 584.7996031160.

It can be divided in two parts, 19999 and 5953, that added together give a palindrome (25952).

The spelling of 199995953 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, nine hundred fifty-three".