199451863 has 4 divisors (see below), whose sum is σ = 214794328. Its totient is φ = 184109400.

The previous prime is 199451843. The next prime is 199451887. The reversal of 199451863 is 368154991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368154991 = 13103 ⋅28097.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199451863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199451843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7671213 + ... + 7671238.

It is an arithmetic number, because the mean of its divisors is an integer number (53698582).

Almost surely, 2^199451863 is an apocalyptic number.

199451863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

199451863 is a deficient number, since it is larger than the sum of its proper divisors (15342465).

199451863 is a wasteful number, since it uses less digits than its factorization.

199451863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15342464.

The product of its digits is 233280, while the sum is 46.

The square root of 199451863 is about 14122.7427576941. The cubic root of 199451863 is about 584.2688047203.

The spelling of 199451863 in words is "one hundred ninety-nine million, four hundred fifty-one thousand, eight hundred sixty-three".