81674825231 has 2 divisors, whose sum is σ = 81674825232. Its totient is φ = 81674825230.

The previous prime is 81674825227. The next prime is 81674825251. The reversal of 81674825231 is 13252847618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81674825231 - 2² = 81674825227 is a prime.

It is a super-2 number, since 2×81674825231² (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 (81674825251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40837412615 + 40837412616.

It is an arithmetic number, because the mean of its divisors is an integer number (40837412616).

Almost surely, 2^81674825231 is an apocalyptic number.

81674825231 is a deficient number, since it is larger than the sum of its proper divisors (1).

81674825231 is an equidigital number, since it uses as much as digits as its factorization.

81674825231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 47.

The spelling of 81674825231 in words is "eighty-one billion, six hundred seventy-four million, eight hundred twenty-five thousand, two hundred thirty-one".