81812345 has 8 divisors (see below), whose sum is σ = 98352576. Its totient is φ = 65331376.

The previous prime is 81812333. The next prime is 81812351. The reversal of 81812345 is 54321818.

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 81812345 - 2²² = 77618041 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11717 + ... + 17346.

It is an arithmetic number, because the mean of its divisors is an integer number (12294072).

Almost surely, 2^81812345 is an apocalyptic number.

It is an amenable number.

81812345 is a deficient number, since it is larger than the sum of its proper divisors (16540231).

81812345 is a wasteful number, since it uses less digits than its factorization.

81812345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29631.

The product of its digits is 7680, while the sum is 32.

The square root of 81812345 is about 9045.0176893138. The cubic root of 81812345 is about 434.1164874513.

The spelling of 81812345 in words is "eighty-one million, eight hundred twelve thousand, three hundred forty-five".