81282823 has 2 divisors, whose sum is σ = 81282824. Its totient is φ = 81282822.

The previous prime is 81282809. The next prime is 81282827. The reversal of 81282823 is 32828218.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81282823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81282827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40641411 + 40641412.

It is an arithmetic number, because the mean of its divisors is an integer number (40641412).

Almost surely, 2^81282823 is an apocalyptic number.

81282823 is a deficient number, since it is larger than the sum of its proper divisors (1).

81282823 is an equidigital number, since it uses as much as digits as its factorization.

81282823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12288, while the sum is 34.

The square root of 81282823 is about 9015.6986972724. The cubic root of 81282823 is about 433.1778680311.

The spelling of 81282823 in words is "eighty-one million, two hundred eighty-two thousand, eight hundred twenty-three".