51436541857391 has 2 divisors, whose sum is σ = 51436541857392. Its totient is φ = 51436541857390.

The previous prime is 51436541857339. The next prime is 51436541857397. The reversal of 51436541857391 is 19375814563415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51436541857391 - 2³⁰ = 51435468115567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51436541857397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25718270928695 + 25718270928696.

It is an arithmetic number, because the mean of its divisors is an integer number (25718270928696).

Almost surely, 2^{51436541857391} is an apocalyptic number.

51436541857391 is a deficient number, since it is larger than the sum of its proper divisors (1).

51436541857391 is an equidigital number, since it uses as much as digits as its factorization.

51436541857391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432000, while the sum is 62.

The spelling of 51436541857391 in words is "fifty-one trillion, four hundred thirty-six billion, five hundred forty-one million, eight hundred fifty-seven thousand, three hundred ninety-one".