81234347 has 4 divisors (see below), whose sum is σ = 86012856. Its totient is φ = 76455840.

The previous prime is 81234337. The next prime is 81234383. The reversal of 81234347 is 74343218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74343218 = 2 ⋅37171609.

It is a cyclic number.

It is not a de Polignac number, because 81234347 - 2²⁶ = 14125483 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81234337) 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, 2389229 + ... + 2389262.

It is an arithmetic number, because the mean of its divisors is an integer number (21503214).

Almost surely, 2^81234347 is an apocalyptic number.

81234347 is a deficient number, since it is larger than the sum of its proper divisors (4778509).

81234347 is a wasteful number, since it uses less digits than its factorization.

81234347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4778508.

The product of its digits is 16128, while the sum is 32.

The square root of 81234347 is about 9013.0098746201. The cubic root of 81234347 is about 433.0917370570.

The spelling of 81234347 in words is "eighty-one million, two hundred thirty-four thousand, three hundred forty-seven".