199967881 has 9 divisors (see below), whose sum is σ = 203668941. Its totient is φ = 196333644.

The previous prime is 199967863. The next prime is 199967899. The reversal of 199967881 is 188769991.

The square root of 199967881 is 14141.

It is a perfect power (a square), and thus also a powerful number.

199967881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (199967863) and next prime (199967899).

It is not a de Polignac number, because 199967881 - 2¹⁹ = 199443593 is a prime.

It is a super-2 number, since 2×199967881² = 79974306863260322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199967861) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1117050 + ... + 1117228.

Almost surely, 2^199967881 is an apocalyptic number.

199967881 is the 14141-st square number.

199967881 is the 7071-st centered octagonal number.

It is an amenable number.

199967881 is a deficient number, since it is larger than the sum of its proper divisors (3701060).

199967881 is an frugal number, since it uses more digits than its factorization.

199967881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 258 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 58.

The cubic root of 199967881 is about 584.7722404580.

The spelling of 199967881 in words is "one hundred ninety-nine million, nine hundred sixty-seven thousand, eight hundred eighty-one".