199621082 has 4 divisors (see below), whose sum is σ = 299431626. Its totient is φ = 99810540.

The previous prime is 199621069. The next prime is 199621091. The reversal of 199621082 is 280126991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 280126991 = 3931 ⋅71261.

It can be written as a sum of positive squares in only one way, i.e., 142301041 + 57320041 = 11929^2 + 7571^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 49905269 + ... + 49905272.

Almost surely, 2^199621082 is an apocalyptic number.

199621082 is a deficient number, since it is larger than the sum of its proper divisors (99810544).

199621082 is an equidigital number, since it uses as much as digits as its factorization.

199621082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99810543.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 199621082 is about 14128.7324979985. The cubic root of 199621082 is about 584.4339931750.

The spelling of 199621082 in words is "one hundred ninety-nine million, six hundred twenty-one thousand, eighty-two".