81027101 has 4 divisors (see below), whose sum is σ = 81060192. Its totient is φ = 80994012.

The previous prime is 81027071. The next prime is 81027109. The reversal of 81027101 is 10172018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81027101 - 2²⁶ = 13918237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81027109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12551 + ... + 17876.

It is an arithmetic number, because the mean of its divisors is an integer number (20265048).

Almost surely, 2^81027101 is an apocalyptic number.

It is an amenable number.

81027101 is a deficient number, since it is larger than the sum of its proper divisors (33091).

81027101 is a wasteful number, since it uses less digits than its factorization.

81027101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33090.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 81027101 is about 9001.5054851952. The cubic root of 81027101 is about 432.7231205333.

Adding to 81027101 its reverse (10172018), we get a palindrome (91199119).

The spelling of 81027101 in words is "eighty-one million, twenty-seven thousand, one hundred one".