51321044009 has 4 divisors (see below), whose sum is σ = 51409989204. Its totient is φ = 51232098816.

The previous prime is 51321043987. The next prime is 51321044011. The reversal of 51321044009 is 90044012315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90044012315 = 5 ⋅18008802463.

It can be written as a sum of positive squares in 2 ways, for example, as 41241486400 + 10079557609 = 203080^2 + 100397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51321044009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51321044069) 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, 44471732 + ... + 44472885.

It is an arithmetic number, because the mean of its divisors is an integer number (12852497301).

Almost surely, 2^51321044009 is an apocalyptic number.

It is an amenable number.

51321044009 is a deficient number, since it is larger than the sum of its proper divisors (88945195).

51321044009 is an equidigital number, since it uses as much as digits as its factorization.

51321044009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88945194.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 51321044009 in words is "fifty-one billion, three hundred twenty-one million, forty-four thousand, nine".