81914792293 has 2 divisors, whose sum is σ = 81914792294. Its totient is φ = 81914792292.

The previous prime is 81914792227. The next prime is 81914792317. The reversal of 81914792293 is 39229741918.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71490994884 + 10423797409 = 267378^2 + 102097^2 .

It is a cyclic number.

It is not a de Polignac number, because 81914792293 - 2⁹ = 81914791781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81914792593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40957396146 + 40957396147.

It is an arithmetic number, because the mean of its divisors is an integer number (40957396147).

Almost surely, 2^81914792293 is an apocalyptic number.

It is an amenable number.

81914792293 is a deficient number, since it is larger than the sum of its proper divisors (1).

81914792293 is an equidigital number, since it uses as much as digits as its factorization.

81914792293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The spelling of 81914792293 in words is "eighty-one billion, nine hundred fourteen million, seven hundred ninety-two thousand, two hundred ninety-three".