5518131249 has 4 divisors (see below), whose sum is σ = 7357508336. Its totient is φ = 3678754164.

The previous prime is 5518131239. The next prime is 5518131313. The reversal of 5518131249 is 9421318155.

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 not a de Polignac number, because 5518131249 - 2⁴ = 5518131233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5518131239) 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, 919688539 + ... + 919688544.

It is an arithmetic number, because the mean of its divisors is an integer number (1839377084).

Almost surely, 2^5518131249 is an apocalyptic number.

It is an amenable number.

5518131249 is a deficient number, since it is larger than the sum of its proper divisors (1839377087).

5518131249 is a wasteful number, since it uses less digits than its factorization.

5518131249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839377086.

The product of its digits is 43200, while the sum is 39.

The square root of 5518131249 is about 74284.1251479749. The cubic root of 5518131249 is about 1767.1117257060. Note that the first 3 decimals are identical.

The spelling of 5518131249 in words is "five billion, five hundred eighteen million, one hundred thirty-one thousand, two hundred forty-nine".