5999249981 has 18 divisors (see below), whose sum is σ = 6558614010. Its totient is φ = 5480268192.

The previous prime is 5999249959. The next prime is 5999250001. The reversal of 5999249981 is 1899429995.

It can be written as a sum of positive squares in 3 ways, for example, as 1500865081 + 4498384900 = 38741^2 + 67070^2 .

It is a de Polignac number, because none of the positive numbers 2^k-5999249981 is a prime.

It is a super-2 number, since 2×5999249981² = 71982000669057000722, 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 (5999249941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7924655 + ... + 7925411.

It is an arithmetic number, because the mean of its divisors is an integer number (364367445).

Almost surely, 2^5999249981 is an apocalyptic number.

It is an amenable number.

5999249981 is a deficient number, since it is larger than the sum of its proper divisors (559364029).

5999249981 is an frugal number, since it uses more digits than its factorization.

5999249981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581 (or 805 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 65.

The square root of 5999249981 is about 77454.8254210156. The cubic root of 5999249981 is about 1817.0448744009.

The spelling of 5999249981 in words is "five billion, nine hundred ninety-nine million, two hundred forty-nine thousand, nine hundred eighty-one".