199404131 has 2 divisors, whose sum is σ = 199404132. Its totient is φ = 199404130.

The previous prime is 199404109. The next prime is 199404143. The reversal of 199404131 is 131404991.

It is a strong prime.

It is an emirp because it is prime and its reverse (131404991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199404131 - 2¹⁰ = 199403107 is a prime.

It is a super-2 number, since 2×199404131² = 79524014919730322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_11047784 and since 199404131 and 11047784 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (199404151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99702065 + 99702066.

It is an arithmetic number, because the mean of its divisors is an integer number (99702066).

Almost surely, 2^199404131 is an apocalyptic number.

199404131 is a deficient number, since it is larger than the sum of its proper divisors (1).

199404131 is an equidigital number, since it uses as much as digits as its factorization.

199404131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 199404131 is about 14121.0527582047. The cubic root of 199404131 is about 584.2221927323. Note that the first 3 decimals are identical.

The spelling of 199404131 in words is "one hundred ninety-nine million, four hundred four thousand, one hundred thirty-one".