51056462521 has 4 divisors (see below), whose sum is σ = 51057435892. Its totient is φ = 51055489152.

The previous prime is 51056462519. The next prime is 51056462539. The reversal of 51056462521 is 12526465015.

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 15772596921 + 35283865600 = 125589^2 + 187840^2 .

It is a cyclic number.

It is not a de Polignac number, because 51056462521 - 2¹ = 51056462519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51056462021) 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, 403236 + ... + 514501.

It is an arithmetic number, because the mean of its divisors is an integer number (12764358973).

Almost surely, 2^51056462521 is an apocalyptic number.

It is an amenable number.

51056462521 is a deficient number, since it is larger than the sum of its proper divisors (973371).

51056462521 is an equidigital number, since it uses as much as digits as its factorization.

51056462521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973370.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 51056462521 in words is "fifty-one billion, fifty-six million, four hundred sixty-two thousand, five hundred twenty-one".