81875023 has 4 divisors (see below), whose sum is σ = 82626280. Its totient is φ = 81123768.

The previous prime is 81875021. The next prime is 81875071. The reversal of 81875023 is 32057818.

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 81875023 - 2¹ = 81875021 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 81875023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81875021) 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, 375465 + ... + 375682.

It is an arithmetic number, because the mean of its divisors is an integer number (20656570).

Almost surely, 2^81875023 is an apocalyptic number.

81875023 is a deficient number, since it is larger than the sum of its proper divisors (751257).

81875023 is a wasteful number, since it uses less digits than its factorization.

81875023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751256.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 81875023 is about 9048.4818063585. The cubic root of 81875023 is about 434.2273207963.

The spelling of 81875023 in words is "eighty-one million, eight hundred seventy-five thousand, twenty-three".