81680201 has 8 divisors (see below), whose sum is σ = 84396480. Its totient is φ = 78990768.

The previous prime is 81680191. The next prime is 81680231. The reversal of 81680201 is 10208618.

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 81680201 - 2¹⁴ = 81663817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81680231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431 + ... + 12788.

It is an arithmetic number, because the mean of its divisors is an integer number (10549560).

Almost surely, 2^81680201 is an apocalyptic number.

It is an amenable number.

81680201 is a deficient number, since it is larger than the sum of its proper divisors (2716279).

81680201 is a wasteful number, since it uses less digits than its factorization.

81680201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13423.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 81680201 is about 9037.7099422365. The cubic root of 81680201 is about 433.8826319420.

Adding to 81680201 its reverse (10208618), we get a palindrome (91888819).

The spelling of 81680201 in words is "eighty-one million, six hundred eighty thousand, two hundred one".