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2660161 = 722332
BaseRepresentation
bin1010001001011101000001
312000011001111
422021131001
51140111121
6133003321
731416400
oct12113501
95004044
102660161
111557689
12a83541
13721a7a
144d3637
153782e1
hex289741

2660161 has 9 divisors (see below), whose sum is σ = 3107811. Its totient is φ = 2270352.

The previous prime is 2660137. The next prime is 2660173. The reversal of 2660161 is 1610662.

The square root of 2660161 is 1631.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 2119936 = 735^2 + 1456^2 .

It is not a de Polignac number, because 2660161 - 215 = 2627393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2660131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11301 + ... + 11533.

22660161 is an apocalyptic number.

2660161 is the 1631-st square number.

2660161 is the 816-th centered octagonal number.

It is an amenable number.

2660161 is a deficient number, since it is larger than the sum of its proper divisors (447650).

2660161 is an frugal number, since it uses more digits than its factorization.

2660161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The cubic root of 2660161 is about 138.5593936073.

It can be divided in two parts, 26601 and 61, that added together give a palindrome (26662).

The spelling of 2660161 in words is "two million, six hundred sixty thousand, one hundred sixty-one".

Divisors: 1 7 49 233 1631 11417 54289 380023 2660161