81342023 has 4 divisors (see below), whose sum is σ = 92962320. Its totient is φ = 69721728.

The previous prime is 81342011. The next prime is 81342031. The reversal of 81342023 is 32024318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32024318 = 2 ⋅16012159.

It is a cyclic number.

It is not a de Polignac number, because 81342023 - 2¹⁴ = 81325639 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 81342023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81342083) 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, 5810138 + ... + 5810151.

It is an arithmetic number, because the mean of its divisors is an integer number (23240580).

Almost surely, 2^81342023 is an apocalyptic number.

81342023 is a deficient number, since it is larger than the sum of its proper divisors (11620297).

81342023 is a wasteful number, since it uses less digits than its factorization.

81342023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11620296.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 81342023 is about 9018.9812617612. The cubic root of 81342023 is about 433.2830067129.

The spelling of 81342023 in words is "eighty-one million, three hundred forty-two thousand, twenty-three".