81341911 has 6 divisors (see below), whose sum is σ = 94622280. Its totient is φ = 69721596.

The previous prime is 81341903. The next prime is 81341917. The reversal of 81341911 is 11914318.

It is not a de Polignac number, because 81341911 - 2³ = 81341903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81341911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81341917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 829971 + ... + 830068.

It is an arithmetic number, because the mean of its divisors is an integer number (15770380).

Almost surely, 2^81341911 is an apocalyptic number.

81341911 is a deficient number, since it is larger than the sum of its proper divisors (13280369).

81341911 is a wasteful number, since it uses less digits than its factorization.

81341911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660053 (or 1660046 counting only the distinct ones).

The product of its digits is 864, while the sum is 28.

The square root of 81341911 is about 9018.9750526321. The cubic root of 81341911 is about 433.2828078501.

It can be divided in two parts, 813 and 41911, that added together give a palindrome (42724).

The spelling of 81341911 in words is "eighty-one million, three hundred forty-one thousand, nine hundred eleven".