199321387 has 2 divisors, whose sum is σ = 199321388. Its totient is φ = 199321386.

The previous prime is 199321357. The next prime is 199321417. The reversal of 199321387 is 783123991.

It is a balanced prime because it is at equal distance from previous prime (199321357) and next prime (199321417).

It is a cyclic number.

It is not a de Polignac number, because 199321387 - 2⁷ = 199321259 is a prime.

It is not a weakly prime, because it can be changed into another prime (199321307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99660693 + 99660694.

It is an arithmetic number, because the mean of its divisors is an integer number (99660694).

Almost surely, 2^199321387 is an apocalyptic number.

199321387 is a deficient number, since it is larger than the sum of its proper divisors (1).

199321387 is an equidigital number, since it uses as much as digits as its factorization.

199321387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 199321387 is about 14118.1226443178. The cubic root of 199321387 is about 584.1413726595.

The spelling of 199321387 in words is "one hundred ninety-nine million, three hundred twenty-one thousand, three hundred eighty-seven".