51512351549 has 2 divisors, whose sum is σ = 51512351550. Its totient is φ = 51512351548.

The previous prime is 51512351531. The next prime is 51512351573. The reversal of 51512351549 is 94515321515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32786344900 + 18726006649 = 181070^2 + 136843^2 .

It is a cyclic number.

It is not a de Polignac number, because 51512351549 - 2²⁸ = 51243916093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51512353549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25756175774 + 25756175775.

It is an arithmetic number, because the mean of its divisors is an integer number (25756175775).

Almost surely, 2^51512351549 is an apocalyptic number.

It is an amenable number.

51512351549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51512351549 is an equidigital number, since it uses as much as digits as its factorization.

51512351549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135000, while the sum is 41.

The spelling of 51512351549 in words is "fifty-one billion, five hundred twelve million, three hundred fifty-one thousand, five hundred forty-nine".