981996205 has 4 divisors (see below), whose sum is σ = 1178395452. Its totient is φ = 785596960.

The previous prime is 981996199. The next prime is 981996217. The reversal of 981996205 is 502699189.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 744034729 + 237961476 = 27277^2 + 15426^2 .

It is not a de Polignac number, because 981996205 - 2⁷ = 981996077 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 98199616 + ... + 98199625.

It is an arithmetic number, because the mean of its divisors is an integer number (294598863).

Almost surely, 2^981996205 is an apocalyptic number.

It is an amenable number.

981996205 is a deficient number, since it is larger than the sum of its proper divisors (196399247).

981996205 is a wasteful number, since it uses less digits than its factorization.

981996205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196399246.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 981996205 is about 31336.8186802681. The cubic root of 981996205 is about 993.9623552091.

The spelling of 981996205 in words is "nine hundred eighty-one million, nine hundred ninety-six thousand, two hundred five".