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561000509 is a prime number
BaseRepresentation
bin100001011100000…
…011000000111101
31110002121210000122
4201130003000331
52122104004014
6131400104325
716621265666
oct4134030075
91402553018
10561000509
11268740a93
12137a650a5
138c2c2584
145471436d
15343b758e
hex2170303d

561000509 has 2 divisors, whose sum is σ = 561000510. Its totient is φ = 561000508.

The previous prime is 561000467. The next prime is 561000551. The reversal of 561000509 is 905000165.

It is a balanced prime because it is at equal distance from previous prime (561000467) and next prime (561000551).

It can be written as a sum of positive squares in only one way, i.e., 534765625 + 26234884 = 23125^2 + 5122^2 .

It is a cyclic number.

It is not a de Polignac number, because 561000509 - 216 = 560934973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561000599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280500254 + 280500255.

It is an arithmetic number, because the mean of its divisors is an integer number (280500255).

Almost surely, 2561000509 is an apocalyptic number.

It is an amenable number.

561000509 is a deficient number, since it is larger than the sum of its proper divisors (1).

561000509 is an equidigital number, since it uses as much as digits as its factorization.

561000509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 561000509 is about 23685.4493096500. The cubic root of 561000509 is about 824.7476468456.

The spelling of 561000509 in words is "five hundred sixty-one million, five hundred nine", and thus it is an aban number.