81071426297 has 2 divisors, whose sum is σ = 81071426298. Its totient is φ = 81071426296.

The previous prime is 81071426279. The next prime is 81071426321. The reversal of 81071426297 is 79262417018.

Together with previous prime (81071426279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46250373481 + 34821052816 = 215059^2 + 186604^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81071426297 is a prime.

It is not a weakly prime, because it can be changed into another prime (81071426797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40535713148 + 40535713149.

It is an arithmetic number, because the mean of its divisors is an integer number (40535713149).

Almost surely, 2^81071426297 is an apocalyptic number.

It is an amenable number.

81071426297 is a deficient number, since it is larger than the sum of its proper divisors (1).

81071426297 is an equidigital number, since it uses as much as digits as its factorization.

81071426297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 81071426297 in words is "eighty-one billion, seventy-one million, four hundred twenty-six thousand, two hundred ninety-seven".