199951069 has 2 divisors, whose sum is σ = 199951070. Its totient is φ = 199951068.

The previous prime is 199951039. The next prime is 199951211. The reversal of 199951069 is 960159991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118265625 + 81685444 = 10875^2 + 9038^2 .

It is a cyclic number.

It is not a de Polignac number, because 199951069 - 2¹¹ = 199949021 is a prime.

It is a super-2 number, since 2×199951069² = 79960859988485522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199951009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99975534 + 99975535.

It is an arithmetic number, because the mean of its divisors is an integer number (99975535).

Almost surely, 2^199951069 is an apocalyptic number.

It is an amenable number.

199951069 is a deficient number, since it is larger than the sum of its proper divisors (1).

199951069 is an equidigital number, since it uses as much as digits as its factorization.

199951069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196830, while the sum is 49.

The square root of 199951069 is about 14140.4055458109. The cubic root of 199951069 is about 584.7558520487.

The spelling of 199951069 in words is "one hundred ninety-nine million, nine hundred fifty-one thousand, sixty-nine".