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561241 = 19109271
BaseRepresentation
bin10001001000001011001
31001111212201
42021001121
5120424431
620010201
74525162
oct2110131
91044781
10561241
1135373a
12230961
131685c5
14108769
15b1461
hex89059

561241 has 8 divisors (see below), whose sum is σ = 598400. Its totient is φ = 524880.

The previous prime is 561229. The next prime is 561251. The reversal of 561241 is 142165.

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

It is a 4-Lehmer number, since φ(561241) divides (561241-1)4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-561241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

561241 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (561251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1936 + ... + 2206.

It is an arithmetic number, because the mean of its divisors is an integer number (74800).

2561241 is an apocalyptic number.

It is an amenable number.

561241 is a deficient number, since it is larger than the sum of its proper divisors (37159).

561241 is a wasteful number, since it uses less digits than its factorization.

561241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399.

The product of its digits is 240, while the sum is 19.

The square root of 561241 is about 749.1601964867. The cubic root of 561241 is about 82.4865481588.

Subtracting from 561241 its product of digits (240), we obtain a square (561001 = 7492).

It can be divided in two parts, 56 and 1241, that multiplied together give a palindrome (69496).

The spelling of 561241 in words is "five hundred sixty-one thousand, two hundred forty-one".

Divisors: 1 19 109 271 2071 5149 29539 561241