250121009 has 2 divisors, whose sum is σ = 250121010. Its totient is φ = 250121008.

The previous prime is 250120987. The next prime is 250121041. The reversal of 250121009 is 900121052.

250121009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160402225 + 89718784 = 12665^2 + 9472^2 .

It is a cyclic number.

It is not a de Polignac number, because 250121009 - 2⁸ = 250120753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (250121099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125060504 + 125060505.

It is an arithmetic number, because the mean of its divisors is an integer number (125060505).

Almost surely, 2^250121009 is an apocalyptic number.

It is an amenable number.

250121009 is a deficient number, since it is larger than the sum of its proper divisors (1).

250121009 is an equidigital number, since it uses as much as digits as its factorization.

250121009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 250121009 is about 15815.2144784698. The cubic root of 250121009 is about 630.0621497434.

The spelling of 250121009 in words is "two hundred fifty million, one hundred twenty-one thousand, nine".