1982171699 has 4 divisors (see below), whose sum is σ = 2007262560. Its totient is φ = 1957080840.

The previous prime is 1982171669. The next prime is 1982171747. The reversal of 1982171699 is 9961712891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1982171699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1982171699.

It is not an unprimeable number, because it can be changed into a prime (1982171669) 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, 12545312 + ... + 12545469.

It is an arithmetic number, because the mean of its divisors is an integer number (501815640).

Almost surely, 2^1982171699 is an apocalyptic number.

1982171699 is a deficient number, since it is larger than the sum of its proper divisors (25090861).

1982171699 is an equidigital number, since it uses as much as digits as its factorization.

1982171699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25090860.

The product of its digits is 489888, while the sum is 53.

The square root of 1982171699 is about 44521.5868877110. The cubic root of 1982171699 is about 1256.1661618629.

The spelling of 1982171699 in words is "one billion, nine hundred eighty-two million, one hundred seventy-one thousand, six hundred ninety-nine".