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2166201 = 322331033
BaseRepresentation
bin1000010000110110111001
311002001110200
420100312321
51023304301
6114232413
724261312
oct10206671
94061420
102166201
11124a554
12885709
135aac9b
14405609
152cbc86
hex210db9

2166201 has 12 divisors (see below), whose sum is σ = 3145428. Its totient is φ = 1436544.

The previous prime is 2166179. The next prime is 2166221. The reversal of 2166201 is 1026612.

It is a happy number.

2166201 is a `hidden beast` number, since 2 + 1 + 662 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1382976 + 783225 = 1176^2 + 885^2 .

It is not a de Polignac number, because 2166201 - 26 = 2166137 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

2166201 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2166221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1581 + ... + 2613.

It is an arithmetic number, because the mean of its divisors is an integer number (262119).

22166201 is an apocalyptic number.

It is an amenable number.

2166201 is a deficient number, since it is larger than the sum of its proper divisors (979227).

2166201 is a wasteful number, since it uses less digits than its factorization.

2166201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1269 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2166201 is about 1471.8019567863. The cubic root of 2166201 is about 129.3896636743.

The spelling of 2166201 in words is "two million, one hundred sixty-six thousand, two hundred one".

Divisors: 1 3 9 233 699 1033 2097 3099 9297 240689 722067 2166201