5518973081 has 4 divisors (see below), whose sum is σ = 5552020992. Its totient is φ = 5485925172.

The previous prime is 5518973069. The next prime is 5518973107. The reversal of 5518973081 is 1803798155.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5518973081 - 2⁶ = 5518973017 is a prime.

It is a super-2 number, since 2×5518973081² = 60918127737605265122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5518973281) 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, 16523705 + ... + 16524038.

It is an arithmetic number, because the mean of its divisors is an integer number (1388005248).

Almost surely, 2^5518973081 is an apocalyptic number.

It is an amenable number.

5518973081 is a deficient number, since it is larger than the sum of its proper divisors (33047911).

5518973081 is a wasteful number, since it uses less digits than its factorization.

5518973081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33047910.

The product of its (nonzero) digits is 302400, while the sum is 47.

The square root of 5518973081 is about 74289.7912300203. The cubic root of 5518973081 is about 1767.2015831528.

The spelling of 5518973081 in words is "five billion, five hundred eighteen million, nine hundred seventy-three thousand, eighty-one".