81010423 has 16 divisors (see below), whose sum is σ = 93350880. Its totient is φ = 69636096.

The previous prime is 81010411. The next prime is 81010441. The reversal of 81010423 is 32401018.

It is a cyclic number.

It is not a de Polignac number, because 81010423 - 2⁹ = 81009911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81010423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81010453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19548 + ... + 23326.

It is an arithmetic number, because the mean of its divisors is an integer number (5834430).

Almost surely, 2^81010423 is an apocalyptic number.

81010423 is a deficient number, since it is larger than the sum of its proper divisors (12340457).

81010423 is a wasteful number, since it uses less digits than its factorization.

81010423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 81010423 is about 9000.5790369287. The cubic root of 81010423 is about 432.6934290213.

The spelling of 81010423 in words is "eighty-one million, ten thousand, four hundred twenty-three".