81605341 has 8 divisors (see below), whose sum is σ = 83808000. Its totient is φ = 79432080.

The previous prime is 81605339. The next prime is 81605393. The reversal of 81605341 is 14350618.

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

It is a cyclic number.

It is not a de Polignac number, because 81605341 - 2¹ = 81605339 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81605141) 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, 1666 + ... + 12883.

It is an arithmetic number, because the mean of its divisors is an integer number (10476000).

Almost surely, 2^81605341 is an apocalyptic number.

It is an amenable number.

81605341 is a deficient number, since it is larger than the sum of its proper divisors (2202659).

81605341 is a wasteful number, since it uses less digits than its factorization.

81605341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14699.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81605341 is about 9033.5674569906. The cubic root of 81605341 is about 433.7500401133.

Adding to 81605341 its reverse (14350618), we get a palindrome (95955959).

The spelling of 81605341 in words is "eighty-one million, six hundred five thousand, three hundred forty-one".