51206194901 has 2 divisors, whose sum is σ = 51206194902. Its totient is φ = 51206194900.

The previous prime is 51206194859. The next prime is 51206194933. The reversal of 51206194901 is 10949160215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25679742001 + 25526452900 = 160249^2 + 159770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51206194901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51206197901) 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, 25603097450 + 25603097451.

It is an arithmetic number, because the mean of its divisors is an integer number (25603097451).

Almost surely, 2^51206194901 is an apocalyptic number.

It is an amenable number.

51206194901 is a deficient number, since it is larger than the sum of its proper divisors (1).

51206194901 is an equidigital number, since it uses as much as digits as its factorization.

51206194901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 51206194901 in words is "fifty-one billion, two hundred six million, one hundred ninety-four thousand, nine hundred one".