5518587631 has 4 divisors (see below), whose sum is σ = 5522084200. Its totient is φ = 5515091064.

The previous prime is 5518587619. The next prime is 5518587689. The reversal of 5518587631 is 1367858155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5518587631 is a prime.

It is a super-2 number, since 2×5518587631² = 60909618882052384322, 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 (5518587691) 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, 1745916 + ... + 1749073.

It is an arithmetic number, because the mean of its divisors is an integer number (1380521050).

Almost surely, 2^5518587631 is an apocalyptic number.

5518587631 is a deficient number, since it is larger than the sum of its proper divisors (3496569).

5518587631 is a wasteful number, since it uses less digits than its factorization.

5518587631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496568.

The product of its digits is 1008000, while the sum is 49.

The square root of 5518587631 is about 74287.1969520994. The cubic root of 5518587631 is about 1767.1604412170.

The spelling of 5518587631 in words is "five billion, five hundred eighteen million, five hundred eighty-seven thousand, six hundred thirty-one".