81571093 has 8 divisors (see below), whose sum is σ = 83354400. Its totient is φ = 79804560.

The previous prime is 81571079. The next prime is 81571103. The reversal of 81571093 is 39017518.

It is a happy number.

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-81571093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81578093) 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, 5898 + ... + 14068.

It is an arithmetic number, because the mean of its divisors is an integer number (10419300).

Almost surely, 2^81571093 is an apocalyptic number.

It is an amenable number.

81571093 is a deficient number, since it is larger than the sum of its proper divisors (1783307).

81571093 is a wasteful number, since it uses less digits than its factorization.

81571093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8387.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 81571093 is about 9031.6716614368. The cubic root of 81571093 is about 433.6893531133.

The spelling of 81571093 in words is "eighty-one million, five hundred seventy-one thousand, ninety-three".