81530214 has 8 divisors (see below), whose sum is σ = 163060440. Its totient is φ = 27176736.

The previous prime is 81530213. The next prime is 81530231. The reversal of 81530214 is 41203518.

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

81530214 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81530213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6794179 + ... + 6794190.

It is an arithmetic number, because the mean of its divisors is an integer number (20382555).

Almost surely, 2^81530214 is an apocalyptic number.

81530214 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81530214 is a wasteful number, since it uses less digits than its factorization.

81530214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13588374.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 81530214 is about 9029.4082862611. The cubic root of 81530214 is about 433.6168938274.

The spelling of 81530214 in words is "eighty-one million, five hundred thirty thousand, two hundred fourteen".