81384377341 has 2 divisors, whose sum is σ = 81384377342. Its totient is φ = 81384377340.

The previous prime is 81384377311. The next prime is 81384377351. The reversal of 81384377341 is 14377348318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77153395225 + 4230982116 = 277765^2 + 65046^2 .

It is a cyclic number.

It is not a de Polignac number, because 81384377341 - 2³¹ = 79236893693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81384377311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40692188670 + 40692188671.

It is an arithmetic number, because the mean of its divisors is an integer number (40692188671).

Almost surely, 2^81384377341 is an apocalyptic number.

It is an amenable number.

81384377341 is a deficient number, since it is larger than the sum of its proper divisors (1).

81384377341 is an equidigital number, since it uses as much as digits as its factorization.

81384377341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 49.

The spelling of 81384377341 in words is "eighty-one billion, three hundred eighty-four million, three hundred seventy-seven thousand, three hundred forty-one".