81348211 has 8 divisors (see below), whose sum is σ = 94947840. Its totient is φ = 68243208.

The previous prime is 81348209. The next prime is 81348229. The reversal of 81348211 is 11284318.

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 81348211 - 2¹ = 81348209 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 81348211.

It is not an unprimeable number, because it can be changed into a prime (81348011) 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, 123301 + ... + 123958.

It is an arithmetic number, because the mean of its divisors is an integer number (11868480).

Almost surely, 2^81348211 is an apocalyptic number.

81348211 is a deficient number, since it is larger than the sum of its proper divisors (13599629).

81348211 is a wasteful number, since it uses less digits than its factorization.

81348211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247313.

The product of its digits is 1536, while the sum is 28.

The square root of 81348211 is about 9019.3243095035. The cubic root of 81348211 is about 433.2939936016.

The spelling of 81348211 in words is "eighty-one million, three hundred forty-eight thousand, two hundred eleven".