251222201 has 2 divisors, whose sum is σ = 251222202. Its totient is φ = 251222200.

The previous prime is 251222189. The next prime is 251222203. The reversal of 251222201 is 102222152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243516025 + 7706176 = 15605^2 + 2776^2 .

It is a cyclic number.

It is not a de Polignac number, because 251222201 - 2¹⁰ = 251221177 is a prime.

It is a super-2 number, since 2×251222201² = 126225188550568802, which contains 22 as substring.

Together with 251222203, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251222201.

It is not a weakly prime, because it can be changed into another prime (251222203) 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, 125611100 + 125611101.

It is an arithmetic number, because the mean of its divisors is an integer number (125611101).

Almost surely, 2^251222201 is an apocalyptic number.

It is an amenable number.

251222201 is a deficient number, since it is larger than the sum of its proper divisors (1).

251222201 is an equidigital number, since it uses as much as digits as its factorization.

251222201 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 17.

The square root of 251222201 is about 15849.9905678205. The cubic root of 251222201 is about 630.9854410643.

Adding to 251222201 its reverse (102222152), we get a palindrome (353444353).

The spelling of 251222201 in words is "two hundred fifty-one million, two hundred twenty-two thousand, two hundred one".