51032046521 has 4 divisors (see below), whose sum is σ = 51178270500. Its totient is φ = 50885822544.

The previous prime is 51032046511. The next prime is 51032046529. The reversal of 51032046521 is 12564023015.

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 43539412921 + 7492633600 = 208661^2 + 86560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51032046521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51032046529) 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, 73111466 + ... + 73112163.

It is an arithmetic number, because the mean of its divisors is an integer number (12794567625).

Almost surely, 2^51032046521 is an apocalyptic number.

It is an amenable number.

51032046521 is a deficient number, since it is larger than the sum of its proper divisors (146223979).

51032046521 is a wasteful number, since it uses less digits than its factorization.

51032046521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146223978.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 51032046521 its reverse (12564023015), we get a palindrome (63596069536).

The spelling of 51032046521 in words is "fifty-one billion, thirty-two million, forty-six thousand, five hundred twenty-one".