81254231 has 2 divisors, whose sum is σ = 81254232. Its totient is φ = 81254230.

The previous prime is 81254227. The next prime is 81254267. The reversal of 81254231 is 13245218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81254231 - 2² = 81254227 is a prime.

It is a super-2 number, since 2×81254231² = 13204500110802722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81254231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81254291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40627115 + 40627116.

It is an arithmetic number, because the mean of its divisors is an integer number (40627116).

Almost surely, 2^81254231 is an apocalyptic number.

81254231 is a deficient number, since it is larger than the sum of its proper divisors (1).

81254231 is an equidigital number, since it uses as much as digits as its factorization.

81254231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 81254231 is about 9014.1128792577. The cubic root of 81254231 is about 433.1270706069.

Adding to 81254231 its reverse (13245218), we get a palindrome (94499449).

The spelling of 81254231 in words is "eighty-one million, two hundred fifty-four thousand, two hundred thirty-one".