1999982981 has 8 divisors (see below), whose sum is σ = 2009814528. Its totient is φ = 1990170000.

The previous prime is 1999982953. The next prime is 1999982983. The reversal of 1999982981 is 1892899991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999982981 is a prime.

It is a super-2 number, since 2×1999982981² = 7999863848579292722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999982983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242831 + ... + 250931.

It is an arithmetic number, because the mean of its divisors is an integer number (251226816).

Almost surely, 2^1999982981 is an apocalyptic number.

It is an amenable number.

1999982981 is a deficient number, since it is larger than the sum of its proper divisors (9831547).

1999982981 is an equidigital number, since it uses as much as digits as its factorization.

1999982981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9283.

The product of its digits is 7558272, while the sum is 65.

The square root of 1999982981 is about 44721.1692713865. The cubic root of 1999982981 is about 1259.9174761187.

The spelling of 1999982981 in words is "one billion, nine hundred ninety-nine million, nine hundred eighty-two thousand, nine hundred eighty-one".