250018121 has 2 divisors, whose sum is σ = 250018122. Its totient is φ = 250018120.

The previous prime is 250018091. The next prime is 250018141. The reversal of 250018121 is 121810052.

It is a happy number.

It is an a-pointer prime, because the next prime (250018141) can be obtained adding 250018121 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156625225 + 93392896 = 12515^2 + 9664^2 .

It is a cyclic number.

It is not a de Polignac number, because 250018121 - 2¹⁴ = 250001737 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 250018093 and 250018102.

It is not a weakly prime, because it can be changed into another prime (250018141) 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, 125009060 + 125009061.

It is an arithmetic number, because the mean of its divisors is an integer number (125009061).

Almost surely, 2^250018121 is an apocalyptic number.

It is an amenable number.

250018121 is a deficient number, since it is larger than the sum of its proper divisors (1).

250018121 is an equidigital number, since it uses as much as digits as its factorization.

250018121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 250018121 is about 15811.9613267931. The cubic root of 250018121 is about 629.9757452659.

Adding to 250018121 its reverse (121810052), we get a palindrome (371828173).

The spelling of 250018121 in words is "two hundred fifty million, eighteen thousand, one hundred twenty-one".