1211100726397 has 2 divisors, whose sum is σ = 1211100726398. Its totient is φ = 1211100726396.

The previous prime is 1211100726379. The next prime is 1211100726413. The reversal of 1211100726397 is 7936270011121.

It is a happy number.

Together with previous prime (1211100726379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1203801758041 + 7298968356 = 1097179^2 + 85434^2 .

It is an emirp because it is prime and its reverse (7936270011121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211100726397 - 2¹¹ = 1211100724349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211100726307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550363198 + 605550363199.

It is an arithmetic number, because the mean of its divisors is an integer number (605550363199).

Almost surely, 2^{1211100726397} is an apocalyptic number.

It is an amenable number.

1211100726397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211100726397 is an equidigital number, since it uses as much as digits as its factorization.

1211100726397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 40.

The spelling of 1211100726397 in words is "one trillion, two hundred eleven billion, one hundred million, seven hundred twenty-six thousand, three hundred ninety-seven".