81165341 has 4 divisors (see below), whose sum is σ = 82376832. Its totient is φ = 79953852.

The previous prime is 81165323. The next prime is 81165349. The reversal of 81165341 is 14356118.

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 81165341 - 2¹⁴ = 81148957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81165349) 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, 605645 + ... + 605778.

It is an arithmetic number, because the mean of its divisors is an integer number (20594208).

Almost surely, 2^81165341 is an apocalyptic number.

It is an amenable number.

81165341 is a deficient number, since it is larger than the sum of its proper divisors (1211491).

81165341 is a wasteful number, since it uses less digits than its factorization.

81165341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211490.

The product of its digits is 2880, while the sum is 29.

The square root of 81165341 is about 9009.1809283641. The cubic root of 81165341 is about 432.9690697540.

The spelling of 81165341 in words is "eighty-one million, one hundred sixty-five thousand, three hundred forty-one".