81020141 has 8 divisors (see below), whose sum is σ = 83160000. Its totient is φ = 78888160.

The previous prime is 81020131. The next prime is 81020179. The reversal of 81020141 is 14102018.

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 81020141 - 2⁶ = 81020077 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 (81020101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22910 + ... + 26208.

It is an arithmetic number, because the mean of its divisors is an integer number (10395000).

Almost surely, 2^81020141 is an apocalyptic number.

It is an amenable number.

81020141 is a deficient number, since it is larger than the sum of its proper divisors (2139859).

81020141 is a wasteful number, since it uses less digits than its factorization.

81020141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 81020141 is about 9001.1188748955. The cubic root of 81020141 is about 432.7107302790.

Adding to 81020141 its reverse (14102018), we get a palindrome (95122159).

The spelling of 81020141 in words is "eighty-one million, twenty thousand, one hundred forty-one".