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1661225 = 5266449
BaseRepresentation
bin110010101100100101001
310010101202212
412111210221
5411124400
655334505
720056136
oct6254451
93111685
101661225
11a35115
12681435
13462197
1431358d
1522c335
hex195929

1661225 has 6 divisors (see below), whose sum is σ = 2059950. Its totient is φ = 1328960.

The previous prime is 1661173. The next prime is 1661237. The reversal of 1661225 is 5221661.

It can be written as a sum of positive squares in 3 ways, for example, as 477481 + 1183744 = 691^2 + 1088^2 .

It is not a de Polignac number, because 1661225 - 26 = 1661161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1661225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33200 + ... + 33249.

It is an arithmetic number, because the mean of its divisors is an integer number (343325).

21661225 is an apocalyptic number.

It is an amenable number.

1661225 is a deficient number, since it is larger than the sum of its proper divisors (398725).

1661225 is an equidigital number, since it uses as much as digits as its factorization.

1661225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66459 (or 66454 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 1661225 is about 1288.8851771977. The cubic root of 1661225 is about 118.4339332751.

Adding to 1661225 its reverse (5221661), we get a palindrome (6882886).

The spelling of 1661225 in words is "one million, six hundred sixty-one thousand, two hundred twenty-five".

Divisors: 1 5 25 66449 332245 1661225