81074862293 has 2 divisors, whose sum is σ = 81074862294. Its totient is φ = 81074862292.

The previous prime is 81074862287. The next prime is 81074862317. The reversal of 81074862293 is 39226847018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44403761284 + 36671101009 = 210722^2 + 191497^2 .

It is a cyclic number.

It is not a de Polignac number, because 81074862293 - 2⁴ = 81074862277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81074862203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40537431146 + 40537431147.

It is an arithmetic number, because the mean of its divisors is an integer number (40537431147).

Almost surely, 2^81074862293 is an apocalyptic number.

It is an amenable number.

81074862293 is a deficient number, since it is larger than the sum of its proper divisors (1).

81074862293 is an equidigital number, since it uses as much as digits as its factorization.

81074862293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 81074862293 in words is "eighty-one billion, seventy-four million, eight hundred sixty-two thousand, two hundred ninety-three".