81404101 has 8 divisors (see below), whose sum is σ = 82041920. Its totient is φ = 80769312.

The previous prime is 81404027. The next prime is 81404111. The reversal of 81404101 is 10140418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81404101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81404111) 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 7 ways as a sum of consecutive naturals, for example, 88120 + ... + 89038.

It is an arithmetic number, because the mean of its divisors is an integer number (10255240).

Almost surely, 2^81404101 is an apocalyptic number.

It is an amenable number.

81404101 is a deficient number, since it is larger than the sum of its proper divisors (637819).

81404101 is a wasteful number, since it uses less digits than its factorization.

81404101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 81404101 is about 9022.4221249064. The cubic root of 81404101 is about 433.3932019189.

Adding to 81404101 its reverse (10140418), we get a palindrome (91544519).

The spelling of 81404101 in words is "eighty-one million, four hundred four thousand, one hundred one".