199613669 has 2 divisors, whose sum is σ = 199613670. Its totient is φ = 199613668.

The previous prime is 199613651. The next prime is 199613671. The reversal of 199613669 is 966316991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197402500 + 2211169 = 14050^2 + 1487^2 .

It is a cyclic number.

It is not a de Polignac number, because 199613669 - 2⁸ = 199613413 is a prime.

It is a super-2 number, since 2×199613669² = 79691233703283122, which contains 22 as substring.

Together with 199613671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199613369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99806834 + 99806835.

It is an arithmetic number, because the mean of its divisors is an integer number (99806835).

Almost surely, 2^199613669 is an apocalyptic number.

It is an amenable number.

199613669 is a deficient number, since it is larger than the sum of its proper divisors (1).

199613669 is an equidigital number, since it uses as much as digits as its factorization.

199613669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 50.

The square root of 199613669 is about 14128.4701578055. The cubic root of 199613669 is about 584.4267586973.

The spelling of 199613669 in words is "one hundred ninety-nine million, six hundred thirteen thousand, six hundred sixty-nine".