199648469 has 2 divisors, whose sum is σ = 199648470. Its totient is φ = 199648468.

The previous prime is 199648457. The next prime is 199648481. The reversal of 199648469 is 964846991.

It is a balanced prime because it is at equal distance from previous prime (199648457) and next prime (199648481).

It can be written as a sum of positive squares in only one way, i.e., 188512900 + 11135569 = 13730^2 + 3337^2 .

It is a cyclic number.

It is not a de Polignac number, because 199648469 - 2⁴ = 199648453 is a prime.

It is a super-2 number, since 2×199648469² = 79719022348087922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199648429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99824234 + 99824235.

It is an arithmetic number, because the mean of its divisors is an integer number (99824235).

Almost surely, 2^199648469 is an apocalyptic number.

It is an amenable number.

199648469 is a deficient number, since it is larger than the sum of its proper divisors (1).

199648469 is an equidigital number, since it uses as much as digits as its factorization.

199648469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 56.

The square root of 199648469 is about 14129.7016599785. The cubic root of 199648469 is about 584.4607190794.

The spelling of 199648469 in words is "one hundred ninety-nine million, six hundred forty-eight thousand, four hundred sixty-nine".