81464243 has 4 divisors (see below), whose sum is σ = 93102000. Its totient is φ = 69826488.

The previous prime is 81464239. The next prime is 81464261. The reversal of 81464243 is 34246418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34246418 = 2 ⋅17123209.

It is a cyclic number.

It is not a de Polignac number, because 81464243 - 2² = 81464239 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (81464203) 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, 5818868 + ... + 5818881.

It is an arithmetic number, because the mean of its divisors is an integer number (23275500).

Almost surely, 2^81464243 is an apocalyptic number.

81464243 is a deficient number, since it is larger than the sum of its proper divisors (11637757).

81464243 is a wasteful number, since it uses less digits than its factorization.

81464243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11637756.

The product of its digits is 18432, while the sum is 32.

The square root of 81464243 is about 9025.7544283013. The cubic root of 81464243 is about 433.4999070981.

The spelling of 81464243 in words is "eighty-one million, four hundred sixty-four thousand, two hundred forty-three".