81767201 has 8 divisors (see below), whose sum is σ = 82949664. Its totient is φ = 80589600.

The previous prime is 81767173. The next prime is 81767207. The reversal of 81767201 is 10276718.

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 81767201 - 2⁶ = 81767137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81767207) 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, 44501 + ... + 46301.

It is an arithmetic number, because the mean of its divisors is an integer number (10368708).

Almost surely, 2^81767201 is an apocalyptic number.

It is an amenable number.

81767201 is a deficient number, since it is larger than the sum of its proper divisors (1182463).

81767201 is a wasteful number, since it uses less digits than its factorization.

81767201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 81767201 is about 9042.5218274550. The cubic root of 81767201 is about 434.0366243594.

The spelling of 81767201 in words is "eighty-one million, seven hundred sixty-seven thousand, two hundred one".