81074182349 has 2 divisors, whose sum is σ = 81074182350. Its totient is φ = 81074182348.

The previous prime is 81074182307. The next prime is 81074182379. The reversal of 81074182349 is 94328147018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47624332900 + 33449849449 = 218230^2 + 182893^2 .

It is a cyclic number.

It is not a de Polignac number, because 81074182349 - 2²⁴ = 81057405133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81074182379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40537091174 + 40537091175.

It is an arithmetic number, because the mean of its divisors is an integer number (40537091175).

Almost surely, 2^81074182349 is an apocalyptic number.

It is an amenable number.

81074182349 is a deficient number, since it is larger than the sum of its proper divisors (1).

81074182349 is an equidigital number, since it uses as much as digits as its factorization.

81074182349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 81074182349 in words is "eighty-one billion, seventy-four million, one hundred eighty-two thousand, three hundred forty-nine".