5681509 has 2 divisors, whose sum is σ = 5681510. Its totient is φ = 5681508.

The previous prime is 5681503. The next prime is 5681521. The reversal of 5681509 is 9051865.

5681509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3422500 + 2259009 = 1850^2 + 1503^2 .

It is a cyclic number.

It is not a de Polignac number, because 5681509 - 2⁷ = 5681381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5681503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840754 + 2840755.

It is an arithmetic number, because the mean of its divisors is an integer number (2840755).

Almost surely, 2^5681509 is an apocalyptic number.

It is an amenable number.

5681509 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681509 is an equidigital number, since it uses as much as digits as its factorization.

5681509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 5681509 is about 2383.5916177064. The cubic root of 5681509 is about 178.4382271270.

The spelling of 5681509 in words is "five million, six hundred eighty-one thousand, five hundred nine".