81025101 has 24 divisors (see below), whose sum is σ = 127452000. Its totient is φ = 49406112.

The previous prime is 81025099. The next prime is 81025117. The reversal of 81025101 is 10152018.

It is not a de Polignac number, because 81025101 - 2¹ = 81025099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81025121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3211 + ... + 13128.

It is an arithmetic number, because the mean of its divisors is an integer number (5310500).

Almost surely, 2^81025101 is an apocalyptic number.

It is an amenable number.

81025101 is a deficient number, since it is larger than the sum of its proper divisors (46426899).

81025101 is a wasteful number, since it uses less digits than its factorization.

81025101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16393 (or 16390 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 81025101 is about 9001.3943919817. The cubic root of 81025101 is about 432.7195601880.

Adding to 81025101 its reverse (10152018), we get a palindrome (91177119).

It can be divided in two parts, 8102 and 5101, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 81025101 in words is "eighty-one million, twenty-five thousand, one hundred one".