81216182 has 8 divisors (see below), whose sum is σ = 126025200. Its totient is φ = 39207784.

The previous prime is 81216133. The next prime is 81216199. The reversal of 81216182 is 28161218.

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

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700082 + ... + 700197.

It is an arithmetic number, because the mean of its divisors is an integer number (15753150).

Almost surely, 2^81216182 is an apocalyptic number.

81216182 is a deficient number, since it is larger than the sum of its proper divisors (44809018).

81216182 is a wasteful number, since it uses less digits than its factorization.

81216182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400310.

The product of its digits is 1536, while the sum is 29.

The square root of 81216182 is about 9012.0021082998. The cubic root of 81216182 is about 433.0594531026.

The spelling of 81216182 in words is "eighty-one million, two hundred sixteen thousand, one hundred eighty-two".