51731574197 has 2 divisors, whose sum is σ = 51731574198. Its totient is φ = 51731574196.

The previous prime is 51731574163. The next prime is 51731574241. The reversal of 51731574197 is 79147513715.

51731574197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49619344516 + 2112229681 = 222754^2 + 45959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51731574197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51731574127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25865787098 + 25865787099.

It is an arithmetic number, because the mean of its divisors is an integer number (25865787099).

Almost surely, 2^51731574197 is an apocalyptic number.

It is an amenable number.

51731574197 is a deficient number, since it is larger than the sum of its proper divisors (1).

51731574197 is an equidigital number, since it uses as much as digits as its factorization.

51731574197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 926100, while the sum is 50.

The spelling of 51731574197 in words is "fifty-one billion, seven hundred thirty-one million, five hundred seventy-four thousand, one hundred ninety-seven".