5181306691 has 4 divisors (see below), whose sum is σ = 5652334584. Its totient is φ = 4710278800.

The previous prime is 5181306679. The next prime is 5181306703. The reversal of 5181306691 is 1966031815.

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

It is an interprime number because it is at equal distance from previous prime (5181306679) and next prime (5181306703).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5181306691 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5181306661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235513930 + ... + 235513951.

It is an arithmetic number, because the mean of its divisors is an integer number (1413083646).

Almost surely, 2^5181306691 is an apocalyptic number.

5181306691 is a deficient number, since it is larger than the sum of its proper divisors (471027893).

5181306691 is a wasteful number, since it uses less digits than its factorization.

5181306691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471027892.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 5181306691 is about 71981.2940353256. The cubic root of 5181306691 is about 1730.3997083928.

The spelling of 5181306691 in words is "five billion, one hundred eighty-one million, three hundred six thousand, six hundred ninety-one".