81296423 has 4 divisors (see below), whose sum is σ = 87550008. Its totient is φ = 75042840.

The previous prime is 81296407. The next prime is 81296447. The reversal of 81296423 is 32469218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81296423 - 2⁴ = 81296407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81296123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3126773 + ... + 3126798.

It is an arithmetic number, because the mean of its divisors is an integer number (21887502).

Almost surely, 2^81296423 is an apocalyptic number.

81296423 is a deficient number, since it is larger than the sum of its proper divisors (6253585).

81296423 is a wasteful number, since it uses less digits than its factorization.

81296423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6253584.

The product of its digits is 20736, while the sum is 35.

The square root of 81296423 is about 9016.4529056609. The cubic root of 81296423 is about 433.2020260277.

The spelling of 81296423 in words is "eighty-one million, two hundred ninety-six thousand, four hundred twenty-three".