81711453 has 8 divisors (see below), whose sum is σ = 109009888. Its totient is φ = 54443664.

The previous prime is 81711431. The next prime is 81711491. The reversal of 81711453 is 35411718.

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

It is not a de Polignac number, because 81711453 - 2⁶ = 81711389 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 81711453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81711403) 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, 475 + ... + 12792.

It is an arithmetic number, because the mean of its divisors is an integer number (13626236).

Almost surely, 2^81711453 is an apocalyptic number.

It is an amenable number.

81711453 is a deficient number, since it is larger than the sum of its proper divisors (27298435).

81711453 is a wasteful number, since it uses less digits than its factorization.

81711453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15323.

The product of its digits is 3360, while the sum is 30.

The square root of 81711453 is about 9039.4387547015. The cubic root of 81711453 is about 433.9379614296.

The spelling of 81711453 in words is "eighty-one million, seven hundred eleven thousand, four hundred fifty-three".