251340212197 has 2 divisors, whose sum is σ = 251340212198. Its totient is φ = 251340212196.

The previous prime is 251340212191. The next prime is 251340212243. The reversal of 251340212197 is 791212043152.

251340212197 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., 157070335041 + 94269877156 = 396321^2 + 307034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251340212197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251340212191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125670106098 + 125670106099.

It is an arithmetic number, because the mean of its divisors is an integer number (125670106099).

Almost surely, 2^251340212197 is an apocalyptic number.

It is an amenable number.

251340212197 is a deficient number, since it is larger than the sum of its proper divisors (1).

251340212197 is an equidigital number, since it uses as much as digits as its factorization.

251340212197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 251340212197 in words is "two hundred fifty-one billion, three hundred forty million, two hundred twelve thousand, one hundred ninety-seven".