199673137 has 2 divisors, whose sum is σ = 199673138. Its totient is φ = 199673136.

The previous prime is 199673099. The next prime is 199673161. The reversal of 199673137 is 731376991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199487376 + 185761 = 14124^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 199673137 - 2¹¹ = 199671089 is a prime.

It is not a weakly prime, because it can be changed into another prime (199673167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99836568 + 99836569.

It is an arithmetic number, because the mean of its divisors is an integer number (99836569).

Almost surely, 2^199673137 is an apocalyptic number.

It is an amenable number.

199673137 is a deficient number, since it is larger than the sum of its proper divisors (1).

199673137 is an equidigital number, since it uses as much as digits as its factorization.

199673137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 214326, while the sum is 46.

The square root of 199673137 is about 14130.5745459978. The cubic root of 199673137 is about 584.4847895257.

It can be divided in two parts, 19967 and 3137, that added together give a square (23104 = 152²).

The spelling of 199673137 in words is "one hundred ninety-nine million, six hundred seventy-three thousand, one hundred thirty-seven".