5121891305 has 4 divisors (see below), whose sum is σ = 6146269572. Its totient is φ = 4097513040.

The previous prime is 5121891283. The next prime is 5121891311. The reversal of 5121891305 is 5031981215.

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

It can be written as a sum of positive squares in 2 ways, for example, as 637714009 + 4484177296 = 25253^2 + 66964^2 .

It is not a de Polignac number, because 5121891305 - 2²⁰ = 5120842729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512189126 + ... + 512189135.

It is an arithmetic number, because the mean of its divisors is an integer number (1536567393).

Almost surely, 2^5121891305 is an apocalyptic number.

It is an amenable number.

5121891305 is a deficient number, since it is larger than the sum of its proper divisors (1024378267).

5121891305 is a wasteful number, since it uses less digits than its factorization.

5121891305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024378266.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 5121891305 is about 71567.3899552024. The cubic root of 5121891305 is about 1723.7599494984.

The spelling of 5121891305 in words is "five billion, one hundred twenty-one million, eight hundred ninety-one thousand, three hundred five".