81214305 has 8 divisors (see below), whose sum is σ = 129942912. Its totient is φ = 43314288.

The previous prime is 81214283. The next prime is 81214307. The reversal of 81214305 is 50341218.

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

It is not a de Polignac number, because 81214305 - 2¹⁵ = 81181537 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81214307) 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, 2707129 + ... + 2707158.

It is an arithmetic number, because the mean of its divisors is an integer number (16242864).

Almost surely, 2^81214305 is an apocalyptic number.

It is an amenable number.

81214305 is a deficient number, since it is larger than the sum of its proper divisors (48728607).

81214305 is a wasteful number, since it uses less digits than its factorization.

81214305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5414295.

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

The square root of 81214305 is about 9011.8979687966. The cubic root of 81214305 is about 433.0561169084.

The spelling of 81214305 in words is "eighty-one million, two hundred fourteen thousand, three hundred five".