199762081 has 2 divisors, whose sum is σ = 199762082. Its totient is φ = 199762080.

The previous prime is 199762051. The next prime is 199762097. The reversal of 199762081 is 180267991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177822225 + 21939856 = 13335^2 + 4684^2 .

It is a cyclic number.

It is not a de Polignac number, because 199762081 - 2⁵ = 199762049 is a prime.

It is a super-2 number, since 2×199762081² = 79809778010901122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199762051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99881040 + 99881041.

It is an arithmetic number, because the mean of its divisors is an integer number (99881041).

Almost surely, 2^199762081 is an apocalyptic number.

It is an amenable number.

199762081 is a deficient number, since it is larger than the sum of its proper divisors (1).

199762081 is an equidigital number, since it uses as much as digits as its factorization.

199762081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 199762081 is about 14133.7214136971. The cubic root of 199762081 is about 584.5715625034.

The spelling of 199762081 in words is "one hundred ninety-nine million, seven hundred sixty-two thousand, eighty-one".