163981982 has 4 divisors (see below), whose sum is σ = 245972976. Its totient is φ = 81990990.

The previous prime is 163981957. The next prime is 163981991. The reversal of 163981982 is 289189361.

163981982 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.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40995494 + ... + 40995497.

It is an arithmetic number, because the mean of its divisors is an integer number (61493244).

Almost surely, 2^163981982 is an apocalyptic number.

163981982 is a deficient number, since it is larger than the sum of its proper divisors (81990994).

163981982 is an equidigital number, since it uses as much as digits as its factorization.

163981982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81990993.

The product of its digits is 186624, while the sum is 47.

The square root of 163981982 is about 12805.5449708320. The cubic root of 163981982 is about 547.3503209748.

The spelling of 163981982 in words is "one hundred sixty-three million, nine hundred eighty-one thousand, nine hundred eighty-two".