199356869 has 2 divisors, whose sum is σ = 199356870. Its totient is φ = 199356868.

The previous prime is 199356821. The next prime is 199356889. The reversal of 199356869 is 968653991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197824225 + 1532644 = 14065^2 + 1238^2 .

It is a cyclic number.

It is not a de Polignac number, because 199356869 - 2¹⁶ = 199291333 is a prime.

It is a super-2 number, since 2×199356869² = 79486322434966322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199356889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99678434 + 99678435.

It is an arithmetic number, because the mean of its divisors is an integer number (99678435).

Almost surely, 2^199356869 is an apocalyptic number.

It is an amenable number.

199356869 is a deficient number, since it is larger than the sum of its proper divisors (1).

199356869 is an equidigital number, since it uses as much as digits as its factorization.

199356869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 56.

The square root of 199356869 is about 14119.3792002340. The cubic root of 199356869 is about 584.1760323863.

The spelling of 199356869 in words is "one hundred ninety-nine million, three hundred fifty-six thousand, eight hundred sixty-nine".