81892124231 has 2 divisors, whose sum is σ = 81892124232. Its totient is φ = 81892124230.

The previous prime is 81892124213. The next prime is 81892124261. The reversal of 81892124231 is 13242129818.

Together with previous prime (81892124213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81892124231 is a prime.

It is a super-2 number, since 2×81892124231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81892124261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40946062115 + 40946062116.

It is an arithmetic number, because the mean of its divisors is an integer number (40946062116).

Almost surely, 2^81892124231 is an apocalyptic number.

81892124231 is a deficient number, since it is larger than the sum of its proper divisors (1).

81892124231 is an equidigital number, since it uses as much as digits as its factorization.

81892124231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The spelling of 81892124231 in words is "eighty-one billion, eight hundred ninety-two million, one hundred twenty-four thousand, two hundred thirty-one".