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8181201 = 372231747
BaseRepresentation
bin11111001101010111010001
3120101122111110
4133031113101
54043244301
6451203533
7126352620
oct37152721
916348443
108181201
114688726
1228a65a9
131905a62
14112d6b7
15ab90d6
hex7cd5d1

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".