81345111 has 8 divisors (see below), whose sum is σ = 108873600. Its totient is φ = 54023352.

The previous prime is 81345067. The next prime is 81345113. The reversal of 81345111 is 11154318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81345111 - 2¹⁷ = 81214039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81345113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50761 + ... + 52338.

It is an arithmetic number, because the mean of its divisors is an integer number (13609200).

Almost surely, 2^81345111 is an apocalyptic number.

81345111 is a deficient number, since it is larger than the sum of its proper divisors (27528489).

81345111 is a wasteful number, since it uses less digits than its factorization.

81345111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103365.

The product of its digits is 480, while the sum is 24.

The square root of 81345111 is about 9019.1524546379. The cubic root of 81345111 is about 433.2884895738.

Adding to 81345111 its reverse (11154318), we get a palindrome (92499429).

The spelling of 81345111 in words is "eighty-one million, three hundred forty-five thousand, one hundred eleven".