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561649 = 1151059
BaseRepresentation
bin10001001000111110001
31001112102211
42021013301
5120433044
620012121
74526314
oct2110761
91045384
10561649
11353a80
12231041
1316884a
1410897b
15b1634
hex891f1

561649 has 4 divisors (see below), whose sum is σ = 612720. Its totient is φ = 510580.

The previous prime is 561607. The next prime is 561667. The reversal of 561649 is 946165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561649 - 27 = 561521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561649.

It is not an unprimeable number, because it can be changed into a prime (567649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25519 + ... + 25540.

It is an arithmetic number, because the mean of its divisors is an integer number (153180).

2561649 is an apocalyptic number.

It is an amenable number.

561649 is a deficient number, since it is larger than the sum of its proper divisors (51071).

561649 is a wasteful number, since it uses less digits than its factorization.

561649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51070.

The product of its digits is 6480, while the sum is 31.

The square root of 561649 is about 749.4324519261. The cubic root of 561649 is about 82.5065314694.

It can be divided in two parts, 5616 and 49, that added together give a palindrome (5665).

The spelling of 561649 in words is "five hundred sixty-one thousand, six hundred forty-nine".

Divisors: 1 11 51059 561649