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50000561 = 133846197
BaseRepresentation
bin1011111010111…
…1001010110001
310111002021212122
42332233022301
5100300004221
64543404025
71144666142
oct276571261
9114067778
1050000561
1126251186
12148b3615
13a488740
1468d7ac9
1545c9eab
hex2faf2b1

50000561 has 4 divisors (see below), whose sum is σ = 53846772. Its totient is φ = 46154352.

The previous prime is 50000557. The next prime is 50000563. The reversal of 50000561 is 16500005.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16500005 = 53300001.

It can be written as a sum of positive squares in 2 ways, for example, as 34000561 + 16000000 = 5831^2 + 4000^2 .

It is a cyclic number.

It is not a de Polignac number, because 50000561 - 22 = 50000557 is a prime.

It is a super-2 number, since 2×500005612 = 5000112200629442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50000563) 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, 1923086 + ... + 1923111.

It is an arithmetic number, because the mean of its divisors is an integer number (13461693).

Almost surely, 250000561 is an apocalyptic number.

It is an amenable number.

50000561 is a deficient number, since it is larger than the sum of its proper divisors (3846211).

50000561 is a wasteful number, since it uses less digits than its factorization.

50000561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846210.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 50000561 is about 7071.1074804446. The cubic root of 50000561 is about 368.4045276867.

Adding to 50000561 its reverse (16500005), we get a palindrome (66500566).

The spelling of 50000561 in words is "fifty million, five hundred sixty-one", and thus it is an aban number.

Divisors: 1 13 3846197 50000561