82181423 has 2 divisors, whose sum is σ = 82181424. Its totient is φ = 82181422.

The previous prime is 82181419. The next prime is 82181453. The reversal of 82181423 is 32418128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82181423 - 2² = 82181419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82181413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41090711 + 41090712.

It is an arithmetic number, because the mean of its divisors is an integer number (41090712).

Almost surely, 2^82181423 is an apocalyptic number.

82181423 is a deficient number, since it is larger than the sum of its proper divisors (1).

82181423 is an equidigital number, since it uses as much as digits as its factorization.

82181423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 29.

The square root of 82181423 is about 9065.3970128175. The cubic root of 82181423 is about 434.7683145505.

The spelling of 82181423 in words is "eighty-two million, one hundred eighty-one thousand, four hundred twenty-three".