73105681 has 4 divisors (see below), whose sum is σ = 79751664. Its totient is φ = 66459700.

The previous prime is 73105679. The next prime is 73105691. The reversal of 73105681 is 18650137.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18650137 = 11 ⋅1695467.

It is a cyclic number.

It is not a de Polignac number, because 73105681 - 2¹ = 73105679 is a prime.

It is a super-2 number, since 2×73105681² = 10688881188947522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73105601) 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, 3322975 + ... + 3322996.

It is an arithmetic number, because the mean of its divisors is an integer number (19937916).

Almost surely, 2^73105681 is an apocalyptic number.

It is an amenable number.

73105681 is a deficient number, since it is larger than the sum of its proper divisors (6645983).

73105681 is a wasteful number, since it uses less digits than its factorization.

73105681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6645982.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 73105681 is about 8550.1860213682. The cubic root of 73105681 is about 418.1355012731.

It can be divided in two parts, 731056 and 81, that added together give a palindrome (731137).

The spelling of 73105681 in words is "seventy-three million, one hundred five thousand, six hundred eighty-one".