2500009 has 2 divisors, whose sum is σ = 2500010. Its totient is φ = 2500008.

The previous prime is 2499997. The next prime is 2500027. The reversal of 2500009 is 9000052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2073600 + 426409 = 1440^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 2500009 - 2⁷ = 2499881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2499965 and 2500001.

It is not a weakly prime, because it can be changed into another prime (2500049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250004 + 1250005.

It is an arithmetic number, because the mean of its divisors is an integer number (1250005).

2^2500009 is an apocalyptic number.

It is an amenable number.

2500009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2500009 is an equidigital number, since it uses as much as digits as its factorization.

2500009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 2500009 is about 1581.1416761315. The cubic root of 2500009 is about 135.7210436946.

It can be divided in two parts, 250000 and 9, that multiplied together give a square (2250000 = 1500²).

The spelling of 2500009 in words is "two million, five hundred thousand, nine".