9982261991 has 12 divisors (see below), whose sum is σ = 11039186592. Its totient is φ = 9018337536.

The previous prime is 9982261957. The next prime is 9982261997. The reversal of 9982261991 is 1991622899.

It is a de Polignac number, because none of the positive numbers 2^k-9982261991 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 (9982261997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 620426 + ... + 636311.

It is an arithmetic number, because the mean of its divisors is an integer number (919932216).

Almost surely, 2^9982261991 is an apocalyptic number.

9982261991 is a deficient number, since it is larger than the sum of its proper divisors (1056924601).

9982261991 is a wasteful number, since it uses less digits than its factorization.

9982261991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256810 (or 1256797 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 56.

The square root of 9982261991 is about 99911.2705904594. The cubic root of 9982261991 is about 2153.1600900416.

The spelling of 9982261991 in words is "nine billion, nine hundred eighty-two million, two hundred sixty-one thousand, nine hundred ninety-one".