3599999981 has 8 divisors (see below), whose sum is σ = 3654937440. Its totient is φ = 3545098128.

The previous prime is 3599999969. The next prime is 3600000011. The reversal of 3599999981 is 1899999953.

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 3599999981 - 2¹⁸ = 3599737837 is a prime.

It is a super-2 number, since 2×3599999981² = 25919999726400000722, 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 (3599999911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252830 + ... + 266688.

It is an arithmetic number, because the mean of its divisors is an integer number (456867180).

Almost surely, 2^3599999981 is an apocalyptic number.

It is an amenable number.

3599999981 is a deficient number, since it is larger than the sum of its proper divisors (54937459).

3599999981 is a wasteful number, since it uses less digits than its factorization.

3599999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17803.

The product of its digits is 63772920, while the sum is 71.

The square root of 3599999981 is about 59999.9998416667. Note that the first 3 decimals coincide. The cubic root of 3599999981 is about 1532.6188620908.

The spelling of 3599999981 in words is "three billion, five hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".