81610871 has 8 divisors (see below), whose sum is σ = 86995200. Its totient is φ = 76335480.

The previous prime is 81610849. The next prime is 81610883. The reversal of 81610871 is 17801618.

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-81610871 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 (81610801) 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, 25685 + ... + 28686.

It is an arithmetic number, because the mean of its divisors is an integer number (10874400).

Almost surely, 2^81610871 is an apocalyptic number.

81610871 is a deficient number, since it is larger than the sum of its proper divisors (5384329).

81610871 is a wasteful number, since it uses less digits than its factorization.

81610871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54469.

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 81610871 is about 9033.8735324334. The cubic root of 81610871 is about 433.7598376074.

The spelling of 81610871 in words is "eighty-one million, six hundred ten thousand, eight hundred seventy-one".