81594697 has 8 divisors (see below), whose sum is σ = 84736512. Its totient is φ = 78484800.

The previous prime is 81594671. The next prime is 81594749. The reversal of 81594697 is 79649518.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81594697 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 81594697.

It is not an unprimeable number, because it can be changed into a prime (81594497) 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, 2704 + ... + 13057.

It is an arithmetic number, because the mean of its divisors is an integer number (10592064).

Almost surely, 2^81594697 is an apocalyptic number.

It is an amenable number.

81594697 is a deficient number, since it is larger than the sum of its proper divisors (3141815).

81594697 is a wasteful number, since it uses less digits than its factorization.

81594697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15959.

The product of its digits is 544320, while the sum is 49.

The square root of 81594697 is about 9032.9783017563. The cubic root of 81594697 is about 433.7311809058.

The spelling of 81594697 in words is "eighty-one million, five hundred ninety-four thousand, six hundred ninety-seven".