51381850609 has 2 divisors, whose sum is σ = 51381850610. Its totient is φ = 51381850608.

The previous prime is 51381850573. The next prime is 51381850621. The reversal of 51381850609 is 90605818315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49521826225 + 1860024384 = 222535^2 + 43128^2 .

It is a cyclic number.

It is not a de Polignac number, because 51381850609 - 2¹⁷ = 51381719537 is a prime.

It is not a weakly prime, because it can be changed into another prime (51381850699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25690925304 + 25690925305.

It is an arithmetic number, because the mean of its divisors is an integer number (25690925305).

Almost surely, 2^51381850609 is an apocalyptic number.

It is an amenable number.

51381850609 is a deficient number, since it is larger than the sum of its proper divisors (1).

51381850609 is an equidigital number, since it uses as much as digits as its factorization.

51381850609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 51381850609 in words is "fifty-one billion, three hundred eighty-one million, eight hundred fifty thousand, six hundred nine".