1001982991 has 4 divisors (see below), whose sum is σ = 1014666400. Its totient is φ = 989299584.

The previous prime is 1001982983. The next prime is 1001983019. The reversal of 1001982991 is 1992891001.

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

It is a cyclic number.

It is not a de Polignac number, because 1001982991 - 2³ = 1001982983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001982911) 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, 6341586 + ... + 6341743.

It is an arithmetic number, because the mean of its divisors is an integer number (253666600).

Almost surely, 2^1001982991 is an apocalyptic number.

1001982991 is a deficient number, since it is larger than the sum of its proper divisors (12683409).

1001982991 is an equidigital number, since it uses as much as digits as its factorization.

1001982991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12683408.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 1001982991 is about 31654.1149141782. The cubic root of 1001982991 is about 1000.6605605637.

The spelling of 1001982991 in words is "one billion, one million, nine hundred eighty-two thousand, nine hundred ninety-one".