51451432493 has 2 divisors, whose sum is σ = 51451432494. Its totient is φ = 51451432492.

The previous prime is 51451432481. The next prime is 51451432507. The reversal of 51451432493 is 39423415415.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31537142569 + 19914289924 = 177587^2 + 141118^2 .

It is a cyclic number.

It is not a de Polignac number, because 51451432493 - 2²⁸ = 51182997037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51451432493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51451432993) 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, 25725716246 + 25725716247.

It is an arithmetic number, because the mean of its divisors is an integer number (25725716247).

Almost surely, 2^51451432493 is an apocalyptic number.

It is an amenable number.

51451432493 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451432493 is an equidigital number, since it uses as much as digits as its factorization.

51451432493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 41.

The spelling of 51451432493 in words is "fifty-one billion, four hundred fifty-one million, four hundred thirty-two thousand, four hundred ninety-three".