5139511816 has 8 divisors (see below), whose sum is σ = 9636584670. Its totient is φ = 2569755904.

The previous prime is 5139511787. The next prime is 5139511831. The reversal of 5139511816 is 6181159315.

It can be written as a sum of positive squares in only one way, i.e., 4511808900 + 627702916 = 67170^2 + 25054^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321219481 + ... + 321219496.

Almost surely, 2^5139511816 is an apocalyptic number.

It is an amenable number.

5139511816 is a deficient number, since it is larger than the sum of its proper divisors (4497072854).

5139511816 is a wasteful number, since it uses less digits than its factorization.

5139511816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642438983 (or 642438979 counting only the distinct ones).

The product of its digits is 32400, while the sum is 40.

The square root of 5139511816 is about 71690.3885887083. The cubic root of 5139511816 is about 1725.7344002800.

The spelling of 5139511816 in words is "five billion, one hundred thirty-nine million, five hundred eleven thousand, eight hundred sixteen".