199979569 has 2 divisors, whose sum is σ = 199979570. Its totient is φ = 199979568.

The previous prime is 199979557. The next prime is 199979581. The reversal of 199979569 is 965979991.

It is a balanced prime because it is at equal distance from previous prime (199979557) and next prime (199979581).

It can be written as a sum of positive squares in only one way, i.e., 130873600 + 69105969 = 11440^2 + 8313^2 .

It is an emirp because it is prime and its reverse (965979991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199979569 - 2⁹ = 199979057 is a prime.

It is a super-2 number, since 2×199979569² = 79983656034851522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 199979569.

It is not a weakly prime, because it can be changed into another prime (199979519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99989784 + 99989785.

It is an arithmetic number, because the mean of its divisors is an integer number (99989785).

Almost surely, 2^199979569 is an apocalyptic number.

It is an amenable number.

199979569 is a deficient number, since it is larger than the sum of its proper divisors (1).

199979569 is an equidigital number, since it uses as much as digits as its factorization.

199979569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12400290, while the sum is 64.

The square root of 199979569 is about 14141.4132603499. The cubic root of 199979569 is about 584.7836334290.

The spelling of 199979569 in words is "one hundred ninety-nine million, nine hundred seventy-nine thousand, five hundred sixty-nine".