251250121 has 2 divisors, whose sum is σ = 251250122. Its totient is φ = 251250120.

The previous prime is 251250119. The next prime is 251250151. The reversal of 251250121 is 121052152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238548025 + 12702096 = 15445^2 + 3564^2 .

It is a cyclic number.

It is not a de Polignac number, because 251250121 - 2¹ = 251250119 is a prime.

Together with 251250119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (251250151) 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, 125625060 + 125625061.

It is an arithmetic number, because the mean of its divisors is an integer number (125625061).

Almost surely, 2^251250121 is an apocalyptic number.

It is an amenable number.

251250121 is a deficient number, since it is larger than the sum of its proper divisors (1).

251250121 is an equidigital number, since it uses as much as digits as its factorization.

251250121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 251250121 is about 15850.8713009727. The cubic root of 251250121 is about 631.0088154062.

The spelling of 251250121 in words is "two hundred fifty-one million, two hundred fifty thousand, one hundred twenty-one".