51111100604197 has 2 divisors, whose sum is σ = 51111100604198. Its totient is φ = 51111100604196.

The previous prime is 51111100604173. The next prime is 51111100604243. The reversal of 51111100604197 is 79140600111115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41787445991041 + 9323654613156 = 6464321^2 + 3053466^2 .

It is a cyclic number.

It is not a de Polignac number, because 51111100604197 - 2¹⁹ = 51111100079909 is a prime.

It is a super-2 number, since 2×51111100604197² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51111100604297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25555550302098 + 25555550302099.

It is an arithmetic number, because the mean of its divisors is an integer number (25555550302099).

Almost surely, 2^{51111100604197} is an apocalyptic number.

It is an amenable number.

51111100604197 is a deficient number, since it is larger than the sum of its proper divisors (1).

51111100604197 is an equidigital number, since it uses as much as digits as its factorization.

51111100604197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 37.

The spelling of 51111100604197 in words is "fifty-one trillion, one hundred eleven billion, one hundred million, six hundred four thousand, one hundred ninety-seven".