199761569 has 4 divisors (see below), whose sum is σ = 228298944. Its totient is φ = 171224196.

The previous prime is 199761563. The next prime is 199761571. The reversal of 199761569 is 965167991.

It is a happy number.

199761569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 965167991 = 151 ⋅6391841.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199761569 is a prime.

It is a super-2 number, since 2×199761569² = 79809368898683522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199761569.

It is not an unprimeable number, because it can be changed into a prime (199761563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14268677 + ... + 14268690.

It is an arithmetic number, because the mean of its divisors is an integer number (57074736).

Almost surely, 2^199761569 is an apocalyptic number.

It is an amenable number.

199761569 is a deficient number, since it is larger than the sum of its proper divisors (28537375).

199761569 is an equidigital number, since it uses as much as digits as its factorization.

199761569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28537374.

The product of its digits is 918540, while the sum is 53.

The square root of 199761569 is about 14133.7033009753. The cubic root of 199761569 is about 584.5710630744.

The spelling of 199761569 in words is "one hundred ninety-nine million, seven hundred sixty-one thousand, five hundred sixty-nine".