81023871 has 8 divisors (see below), whose sum is σ = 112728960. Its totient is φ = 51667352.

The previous prime is 81023869. The next prime is 81023881. The reversal of 81023871 is 17832018.

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 not a de Polignac number, because 81023871 - 2¹ = 81023869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81023861) 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, 587061 + ... + 587198.

It is an arithmetic number, because the mean of its divisors is an integer number (14091120).

Almost surely, 2^81023871 is an apocalyptic number.

81023871 is a deficient number, since it is larger than the sum of its proper divisors (31705089).

81023871 is a wasteful number, since it uses less digits than its factorization.

81023871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174285.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 81023871 is about 9001.3260689745. The cubic root of 81023871 is about 432.7173705466.

Adding to 81023871 its reverse (17832018), we get a palindrome (98855889).

The spelling of 81023871 in words is "eighty-one million, twenty-three thousand, eight hundred seventy-one".