81681101341 has 4 divisors (see below), whose sum is σ = 93349830112. Its totient is φ = 70012372572.

The previous prime is 81681101317. The next prime is 81681101357. The reversal of 81681101341 is 14310118618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81681101341 - 2⁵ = 81681101309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81681101297 and 81681101306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81681101311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5834364375 + ... + 5834364388.

It is an arithmetic number, because the mean of its divisors is an integer number (23337457528).

Almost surely, 2^81681101341 is an apocalyptic number.

It is an amenable number.

81681101341 is a deficient number, since it is larger than the sum of its proper divisors (11668728771).

81681101341 is a wasteful number, since it uses less digits than its factorization.

81681101341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11668728770.

The product of its (nonzero) digits is 4608, while the sum is 34.

Adding to 81681101341 its reverse (14310118618), we get a palindrome (95991219959).

The spelling of 81681101341 in words is "eighty-one billion, six hundred eighty-one million, one hundred one thousand, three hundred forty-one".