81741097237 has 2 divisors, whose sum is σ = 81741097238. Its totient is φ = 81741097236.

The previous prime is 81741097211. The next prime is 81741097253. The reversal of 81741097237 is 73279014718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77599016356 + 4142080881 = 278566^2 + 64359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81741097237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81741097037) 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, 40870548618 + 40870548619.

It is an arithmetic number, because the mean of its divisors is an integer number (40870548619).

Almost surely, 2^81741097237 is an apocalyptic number.

It is an amenable number.

81741097237 is a deficient number, since it is larger than the sum of its proper divisors (1).

81741097237 is an equidigital number, since it uses as much as digits as its factorization.

81741097237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 49.

The spelling of 81741097237 in words is "eighty-one billion, seven hundred forty-one million, ninety-seven thousand, two hundred thirty-seven".