81254843 has 4 divisors (see below), whose sum is σ = 81276048. Its totient is φ = 81233640.

The previous prime is 81254827. The next prime is 81254851. The reversal of 81254843 is 34845218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81254843 - 2⁴ = 81254827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81254893) 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, 3071 + ... + 13112.

It is an arithmetic number, because the mean of its divisors is an integer number (20319012).

Almost surely, 2^81254843 is an apocalyptic number.

81254843 is a deficient number, since it is larger than the sum of its proper divisors (21205).

81254843 is a wasteful number, since it uses less digits than its factorization.

81254843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21204.

The product of its digits is 30720, while the sum is 35.

The square root of 81254843 is about 9014.1468259620. The cubic root of 81254843 is about 433.1281580297.

It can be divided in two parts, 812 and 54843, that added together give a palindrome (55655).

The spelling of 81254843 in words is "eighty-one million, two hundred fifty-four thousand, eight hundred forty-three".