81420141 has 8 divisors (see below), whose sum is σ = 118429344. Its totient is φ = 49345520.

The previous prime is 81420127. The next prime is 81420179. The reversal of 81420141 is 14102418.

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 81420141 - 2⁹ = 81419629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81420181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1233606 + ... + 1233671.

It is an arithmetic number, because the mean of its divisors is an integer number (14803668).

Almost surely, 2^81420141 is an apocalyptic number.

It is an amenable number.

81420141 is a deficient number, since it is larger than the sum of its proper divisors (37009203).

81420141 is a wasteful number, since it uses less digits than its factorization.

81420141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467291.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 81420141 is about 9023.3109776844. The cubic root of 81420141 is about 433.4216655563.

Adding to 81420141 its reverse (14102418), we get a palindrome (95522559).

The spelling of 81420141 in words is "eighty-one million, four hundred twenty thousand, one hundred forty-one".