51334542521 has 4 divisors (see below), whose sum is σ = 51335635572. Its totient is φ = 51333449472.

The previous prime is 51334542491. The next prime is 51334542529. The reversal of 51334542521 is 12524543315.

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 7825171600 + 43509370921 = 88460^2 + 208589^2 .

It is a cyclic number.

It is not a de Polignac number, because 51334542521 - 2¹⁰ = 51334541497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51334542529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472760 + ... + 571113.

It is an arithmetic number, because the mean of its divisors is an integer number (12833908893).

Almost surely, 2^51334542521 is an apocalyptic number.

It is an amenable number.

51334542521 is a deficient number, since it is larger than the sum of its proper divisors (1093051).

51334542521 is a wasteful number, since it uses less digits than its factorization.

51334542521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093050.

The product of its digits is 72000, while the sum is 35.

The spelling of 51334542521 in words is "fifty-one billion, three hundred thirty-four million, five hundred forty-two thousand, five hundred twenty-one".