199979069 has 2 divisors, whose sum is σ = 199979070. Its totient is φ = 199979068.

The previous prime is 199979057. The next prime is 199979081. The reversal of 199979069 is 960979991.

It is a balanced prime because it is at equal distance from previous prime (199979057) and next prime (199979081).

It can be written as a sum of positive squares in only one way, i.e., 130256569 + 69722500 = 11413^2 + 8350^2 .

It is a cyclic number.

It is not a de Polignac number, because 199979069 - 2⁴ = 199979053 is a prime.

It is a super-2 number, since 2×199979069² = 79983256076213522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 199978999 and 199979017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199979029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99989534 + 99989535.

It is an arithmetic number, because the mean of its divisors is an integer number (99989535).

Almost surely, 2^199979069 is an apocalyptic number.

It is an amenable number.

199979069 is a deficient number, since it is larger than the sum of its proper divisors (1).

199979069 is an equidigital number, since it uses as much as digits as its factorization.

199979069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2480058, while the sum is 59.

The square root of 199979069 is about 14141.3955817663. The cubic root of 199979069 is about 584.7831460591.

The spelling of 199979069 in words is "one hundred ninety-nine million, nine hundred seventy-nine thousand, sixty-nine".