51431440321 has 2 divisors, whose sum is σ = 51431440322. Its totient is φ = 51431440320.

The previous prime is 51431440267. The next prime is 51431440339. The reversal of 51431440321 is 12304413415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51431436225 + 4096 = 226785^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 51431440321 - 2²⁹ = 50894569409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51431440321.

It is not a weakly prime, because it can be changed into another prime (51431440391) 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 as a sum of consecutive naturals, namely, 25715720160 + 25715720161.

It is an arithmetic number, because the mean of its divisors is an integer number (25715720161).

Almost surely, 2^51431440321 is an apocalyptic number.

It is an amenable number.

51431440321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51431440321 is an equidigital number, since it uses as much as digits as its factorization.

51431440321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 51431440321 its reverse (12304413415), we get a palindrome (63735853736).

The spelling of 51431440321 in words is "fifty-one billion, four hundred thirty-one million, four hundred forty thousand, three hundred twenty-one".