5999981 has 8 divisors (see below), whose sum is σ = 6619704. Its totient is φ = 5402880.

The previous prime is 5999947. The next prime is 5999993. The reversal of 5999981 is 1899995.

It can be written as a sum of positive squares in 4 ways, for example, as 70756 + 5929225 = 266^2 + 2435^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 5999981 - 2¹⁰ = 5998957 is a prime.

It is a super-2 number, since 2×5999981² = 71999544000722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5999911) 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, 5096 + ... + 6161.

It is an arithmetic number, because the mean of its divisors is an integer number (827463).

Almost surely, 2^5999981 is an apocalyptic number.

It is an amenable number.

5999981 is a deficient number, since it is larger than the sum of its proper divisors (619723).

5999981 is a wasteful number, since it uses less digits than its factorization.

5999981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11311.

The product of its digits is 262440, while the sum is 50.

The square root of 5999981 is about 2449.4858644213. The cubic root of 5999981 is about 181.7118674758.

The spelling of 5999981 in words is "five million, nine hundred ninety-nine thousand, nine hundred eighty-one".