250040009 has 2 divisors, whose sum is σ = 250040010. Its totient is φ = 250040008.

The previous prime is 250039987. The next prime is 250040023. The reversal of 250040009 is 900040052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200647225 + 49392784 = 14165^2 + 7028^2 .

It is a cyclic number.

It is not a de Polignac number, because 250040009 - 2¹² = 250035913 is a prime.

It is a super-2 number, since 2×250040009² = 125040012201440162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (250040069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125020004 + 125020005.

It is an arithmetic number, because the mean of its divisors is an integer number (125020005).

Almost surely, 2^250040009 is an apocalyptic number.

It is an amenable number.

250040009 is a deficient number, since it is larger than the sum of its proper divisors (1).

250040009 is an equidigital number, since it uses as much as digits as its factorization.

250040009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 250040009 is about 15812.6534458958. The cubic root of 250040009 is about 629.9941286091.

The spelling of 250040009 in words is "two hundred fifty million, forty thousand, nine".