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2081661 = 32330169
BaseRepresentation
bin111111100001101111101
310220202111120
413330031331
51013103121
6112341153
723456661
oct7741575
93822446
102081661
1111a1a8a
128447b9
1357b66a
143c28a1
152b1bc6
hex1fc37d

2081661 has 8 divisors (see below), whose sum is σ = 2896320. Its totient is φ = 1327392.

The previous prime is 2081647. The next prime is 2081671. The reversal of 2081661 is 1661802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2081661 - 213 = 2073469 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081671) 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, 15016 + ... + 15153.

It is an arithmetic number, because the mean of its divisors is an integer number (362040).

22081661 is an apocalyptic number.

It is an amenable number.

2081661 is a deficient number, since it is larger than the sum of its proper divisors (814659).

2081661 is a wasteful number, since it uses less digits than its factorization.

2081661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30195.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2081661 is about 1442.7962434107. The cubic root of 2081661 is about 127.6840555893.

The spelling of 2081661 in words is "two million, eighty-one thousand, six hundred sixty-one".

Divisors: 1 3 23 69 30169 90507 693887 2081661