199953709 has 2 divisors, whose sum is σ = 199953710. Its totient is φ = 199953708.

The previous prime is 199953707. The next prime is 199953727. The reversal of 199953709 is 907359991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191268900 + 8684809 = 13830^2 + 2947^2 .

It is a cyclic number.

It is not a de Polignac number, because 199953709 - 2¹ = 199953707 is a prime.

It is a super-3 number, since 3×199953709³ (a number of 26 digits) contains 333 as substring.

Together with 199953707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199953707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99976854 + 99976855.

It is an arithmetic number, because the mean of its divisors is an integer number (99976855).

Almost surely, 2^199953709 is an apocalyptic number.

It is an amenable number.

199953709 is a deficient number, since it is larger than the sum of its proper divisors (1).

199953709 is an equidigital number, since it uses as much as digits as its factorization.

199953709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 688905, while the sum is 52.

The square root of 199953709 is about 14140.4988950178. The cubic root of 199953709 is about 584.7584255928.

The spelling of 199953709 in words is "one hundred ninety-nine million, nine hundred fifty-three thousand, seven hundred nine".