6249809 has 2 divisors, whose sum is σ = 6249810. Its totient is φ = 6249808.

The previous prime is 6249791. The next prime is 6249821. The reversal of 6249809 is 9089426.

6249809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6027025 + 222784 = 2455^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 6249809 - 2⁸ = 6249553 is a prime.

It is a super-2 number, since 2×6249809² = 78120225072962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6249839) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3124904 + 3124905.

It is an arithmetic number, because the mean of its divisors is an integer number (3124905).

Almost surely, 2^6249809 is an apocalyptic number.

It is an amenable number.

6249809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6249809 is an equidigital number, since it uses as much as digits as its factorization.

6249809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 6249809 is about 2499.9617997081. The cubic root of 6249809 is about 184.1996985129.

The spelling of 6249809 in words is "six million, two hundred forty-nine thousand, eight hundred nine".