51433040321 has 4 divisors (see below), whose sum is σ = 55389428052. Its totient is φ = 47476652592.

The previous prime is 51433040279. The next prime is 51433040353. The reversal of 51433040321 is 12304033415.

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 31906890625 + 19526149696 = 178625^2 + 139736^2 .

It is a cyclic number.

It is not a de Polignac number, because 51433040321 - 2⁶ = 51433040257 is a prime.

It is a super-2 number, since 2×51433040321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51433040221) 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, 1978193846 + ... + 1978193871.

It is an arithmetic number, because the mean of its divisors is an integer number (13847357013).

Almost surely, 2^51433040321 is an apocalyptic number.

It is an amenable number.

51433040321 is a deficient number, since it is larger than the sum of its proper divisors (3956387731).

51433040321 is a wasteful number, since it uses less digits than its factorization.

51433040321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956387730.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 51433040321 its reverse (12304033415), we get a palindrome (63737073736).

The spelling of 51433040321 in words is "fifty-one billion, four hundred thirty-three million, forty thousand, three hundred twenty-one".