8181201 has 16 divisors (see below), whose sum is σ = 12529664. Its totient is φ = 4651344.
The previous prime is 8181193. The next prime is 8181203. The reversal of 8181201 is 1021818.
It is not a de Polignac number, because 8181201 - 23 = 8181193 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (21).
8181201 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (8181203) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3810 + ... + 5556.
It is an arithmetic number, because the mean of its divisors is an integer number (783104).
Almost surely, 28181201 is an apocalyptic number.
It is an amenable number.
8181201 is a deficient number, since it is larger than the sum of its proper divisors (4348463).
8181201 is a wasteful number, since it uses less digits than its factorization.
8181201 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1980.
The product of its (nonzero) digits is 128, while the sum is 21.
The square root of 8181201 is about 2860.2798814102. The cubic root of 8181201 is about 201.4987490353.
The spelling of 8181201 in words is "eight million, one hundred eighty-one thousand, two hundred one".
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