981205199 has 4 divisors (see below), whose sum is σ = 1056682536. Its totient is φ = 905727864.

The previous prime is 981205187. The next prime is 981205213. The reversal of 981205199 is 991502189.

It is a happy number.

981205199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991502189 = 131 ⋅7568719.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981205199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981208199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37738649 + ... + 37738674.

It is an arithmetic number, because the mean of its divisors is an integer number (264170634).

Almost surely, 2^981205199 is an apocalyptic number.

981205199 is a deficient number, since it is larger than the sum of its proper divisors (75477337).

981205199 is a wasteful number, since it uses less digits than its factorization.

981205199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75477336.

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 981205199 is about 31324.1951053814. The cubic root of 981205199 is about 993.6954019079.

The spelling of 981205199 in words is "nine hundred eighty-one million, two hundred five thousand, one hundred ninety-nine".