51000911197 has 2 divisors, whose sum is σ = 51000911198. Its totient is φ = 51000911196.

The previous prime is 51000911189. The next prime is 51000911207. The reversal of 51000911197 is 79111900015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49824489796 + 1176421401 = 223214^2 + 34299^2 .

It is a cyclic number.

It is not a de Polignac number, because 51000911197 - 2³ = 51000911189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51000914197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25500455598 + 25500455599.

It is an arithmetic number, because the mean of its divisors is an integer number (25500455599).

Almost surely, 2^51000911197 is an apocalyptic number.

It is an amenable number.

51000911197 is a deficient number, since it is larger than the sum of its proper divisors (1).

51000911197 is an equidigital number, since it uses as much as digits as its factorization.

51000911197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 34.

The spelling of 51000911197 in words is "fifty-one billion, nine hundred eleven thousand, one hundred ninety-seven".