199905231 has 8 divisors (see below), whose sum is σ = 268030080. Its totient is φ = 132525272.

The previous prime is 199905229. The next prime is 199905271. The reversal of 199905231 is 132509991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199905231 - 2¹ = 199905229 is a prime.

It is a super-2 number, since 2×199905231² = 79924202762326722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 199905231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199905271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185595 + ... + 186668.

It is an arithmetic number, because the mean of its divisors is an integer number (33503760).

Almost surely, 2^199905231 is an apocalyptic number.

199905231 is a deficient number, since it is larger than the sum of its proper divisors (68124849).

199905231 is a wasteful number, since it uses less digits than its factorization.

199905231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372445.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 199905231 is about 14138.7846365945. The cubic root of 199905231 is about 584.7111643036.

The spelling of 199905231 in words is "one hundred ninety-nine million, nine hundred five thousand, two hundred thirty-one".