199609673 has 2 divisors, whose sum is σ = 199609674. Its totient is φ = 199609672.

The previous prime is 199609661. The next prime is 199609679. The reversal of 199609673 is 376906991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199459129 + 150544 = 14123^2 + 388^2 .

It is a cyclic number.

It is not a de Polignac number, because 199609673 - 2¹⁰ = 199608649 is a prime.

It is not a weakly prime, because it can be changed into another prime (199609679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99804836 + 99804837.

It is an arithmetic number, because the mean of its divisors is an integer number (99804837).

Almost surely, 2^199609673 is an apocalyptic number.

It is an amenable number.

199609673 is a deficient number, since it is larger than the sum of its proper divisors (1).

199609673 is an equidigital number, since it uses as much as digits as its factorization.

199609673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 199609673 is about 14128.3287405128. The cubic root of 199609673 is about 584.4228588560.

The spelling of 199609673 in words is "one hundred ninety-nine million, six hundred nine thousand, six hundred seventy-three".