51551131399 has 2 divisors, whose sum is σ = 51551131400. Its totient is φ = 51551131398.

The previous prime is 51551131343. The next prime is 51551131453. The reversal of 51551131399 is 99313115515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51551131399 - 2⁷ = 51551131271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51551131199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25775565699 + 25775565700.

It is an arithmetic number, because the mean of its divisors is an integer number (25775565700).

Almost surely, 2^51551131399 is an apocalyptic number.

51551131399 is a deficient number, since it is larger than the sum of its proper divisors (1).

51551131399 is an equidigital number, since it uses as much as digits as its factorization.

51551131399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91125, while the sum is 43.

The spelling of 51551131399 in words is "fifty-one billion, five hundred fifty-one million, one hundred thirty-one thousand, three hundred ninety-nine".