199951506 has 24 divisors (see below), whose sum is σ = 443796444. Its totient is φ = 65024640.

The previous prime is 199951487. The next prime is 199951529. The reversal of 199951506 is 605159991.

It is a happy number.

199951506 is a `hidden beast` number, since 1 + 9 + 99 + 51 + 506 = 666.

199951506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 170694225 + 29257281 = 13065^2 + 5409^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134731 + ... + 136206.

Almost surely, 2^199951506 is an apocalyptic number.

199951506 is an abundant number, since it is smaller than the sum of its proper divisors (243844938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199951506 is a wasteful number, since it uses less digits than its factorization.

199951506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270986 (or 270983 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 45.

The square root of 199951506 is about 14140.4209979760. The cubic root of 199951506 is about 584.7562780498.

The spelling of 199951506 in words is "one hundred ninety-nine million, nine hundred fifty-one thousand, five hundred six".