251422441 has 2 divisors, whose sum is σ = 251422442. Its totient is φ = 251422440.

The previous prime is 251422403. The next prime is 251422471. The reversal of 251422441 is 144224152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129960000 + 121462441 = 11400^2 + 11021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251422441 is a prime.

It is not a weakly prime, because it can be changed into another prime (251422471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125711220 + 125711221.

It is an arithmetic number, because the mean of its divisors is an integer number (125711221).

Almost surely, 2^251422441 is an apocalyptic number.

It is an amenable number.

251422441 is a deficient number, since it is larger than the sum of its proper divisors (1).

251422441 is an equidigital number, since it uses as much as digits as its factorization.

251422441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 25.

The square root of 251422441 is about 15856.3060326168. The cubic root of 251422441 is about 631.1530416582.

Adding to 251422441 its reverse (144224152), we get a palindrome (395646593).

The spelling of 251422441 in words is "two hundred fifty-one million, four hundred twenty-two thousand, four hundred forty-one".