81354523 has 8 divisors (see below), whose sum is σ = 87253200. Its totient is φ = 75617568.

The previous prime is 81354517. The next prime is 81354529. The reversal of 81354523 is 32545318.

It is an interprime number because it is at equal distance from previous prime (81354517) and next prime (81354529).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81354523 - 2⁵ = 81354491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81354529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39388 + ... + 41401.

It is an arithmetic number, because the mean of its divisors is an integer number (10906650).

Almost surely, 2^81354523 is an apocalyptic number.

81354523 is a deficient number, since it is larger than the sum of its proper divisors (5898677).

81354523 is a wasteful number, since it uses less digits than its factorization.

81354523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80861.

The product of its digits is 14400, while the sum is 31.

The square root of 81354523 is about 9019.6742180635. The cubic root of 81354523 is about 433.3052000802.

It can be divided in two parts, 8 and 1354523, that added together give a palindrome (1354531).

The spelling of 81354523 in words is "eighty-one million, three hundred fifty-four thousand, five hundred twenty-three".