51204327917 has 2 divisors, whose sum is σ = 51204327918. Its totient is φ = 51204327916.

The previous prime is 51204327899. The next prime is 51204327929. The reversal of 51204327917 is 71972340215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43666789156 + 7537538761 = 208966^2 + 86819^2 .

It is a cyclic number.

It is not a de Polignac number, because 51204327917 - 2⁸ = 51204327661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51204323917) 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, 25602163958 + 25602163959.

It is an arithmetic number, because the mean of its divisors is an integer number (25602163959).

Almost surely, 2^51204327917 is an apocalyptic number.

It is an amenable number.

51204327917 is a deficient number, since it is larger than the sum of its proper divisors (1).

51204327917 is an equidigital number, since it uses as much as digits as its factorization.

51204327917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 51204327917 in words is "fifty-one billion, two hundred four million, three hundred twenty-seven thousand, nine hundred seventeen".