199954693 has 2 divisors, whose sum is σ = 199954694. Its totient is φ = 199954692.

The previous prime is 199954691. The next prime is 199954721. The reversal of 199954693 is 396459991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199176769 + 777924 = 14113^2 + 882^2 .

It is a cyclic number.

It is not a de Polignac number, because 199954693 - 2¹ = 199954691 is a prime.

Together with 199954691, 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 (199954691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99977346 + 99977347.

It is an arithmetic number, because the mean of its divisors is an integer number (99977347).

Almost surely, 2^199954693 is an apocalyptic number.

It is an amenable number.

199954693 is a deficient number, since it is larger than the sum of its proper divisors (1).

199954693 is an equidigital number, since it uses as much as digits as its factorization.

199954693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2361960, while the sum is 55.

The square root of 199954693 is about 14140.5336886555. The cubic root of 199954693 is about 584.7593848170.

The spelling of 199954693 in words is "one hundred ninety-nine million, nine hundred fifty-four thousand, six hundred ninety-three".