16250009 has 2 divisors, whose sum is σ = 16250010. Its totient is φ = 16250008.

The previous prime is 16249963. The next prime is 16250023. The reversal of 16250009 is 90005261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12816400 + 3433609 = 3580^2 + 1853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16250009 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16250099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8125004 + 8125005.

It is an arithmetic number, because the mean of its divisors is an integer number (8125005).

Almost surely, 2^16250009 is an apocalyptic number.

It is an amenable number.

16250009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16250009 is an equidigital number, since it uses as much as digits as its factorization.

16250009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 16250009 is about 4031.1299904617. The cubic root of 16250009 is about 253.2898977162.

The spelling of 16250009 in words is "sixteen million, two hundred fifty thousand, nine".