4256009 has 2 divisors, whose sum is σ = 4256010. Its totient is φ = 4256008.

The previous prime is 4256003. The next prime is 4256029. The reversal of 4256009 is 9006524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4182025 + 73984 = 2045^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 4256009 - 2²⁰ = 3207433 is a prime.

It is a super-2 number, since 2×4256009² = 36227225216162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4256003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128004 + 2128005.

It is an arithmetic number, because the mean of its divisors is an integer number (2128005).

Almost surely, 2^4256009 is an apocalyptic number.

It is an amenable number.

4256009 is a deficient number, since it is larger than the sum of its proper divisors (1).

4256009 is an equidigital number, since it uses as much as digits as its factorization.

4256009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 4256009 is about 2063.0096945967. The cubic root of 4256009 is about 162.0568946126.

The spelling of 4256009 in words is "four million, two hundred fifty-six thousand, nine".