81092423 has 2 divisors, whose sum is σ = 81092424. Its totient is φ = 81092422.

The previous prime is 81092413. The next prime is 81092443. The reversal of 81092423 is 32429018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81092423 - 2²⁶ = 13983559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81092413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40546211 + 40546212.

It is an arithmetic number, because the mean of its divisors is an integer number (40546212).

Almost surely, 2^81092423 is an apocalyptic number.

81092423 is a deficient number, since it is larger than the sum of its proper divisors (1).

81092423 is an equidigital number, since it uses as much as digits as its factorization.

81092423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 81092423 is about 9005.1331472666. The cubic root of 81092423 is about 432.8393727783.

The spelling of 81092423 in words is "eighty-one million, ninety-two thousand, four hundred twenty-three".