251424521 has 2 divisors, whose sum is σ = 251424522. Its totient is φ = 251424520.

The previous prime is 251424487. The next prime is 251424553. The reversal of 251424521 is 125424152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147282496 + 104142025 = 12136^2 + 10205^2 .

It is a cyclic number.

It is not a de Polignac number, because 251424521 - 2¹⁴ = 251408137 is a prime.

It is not a weakly prime, because it can be changed into another prime (251424221) 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, 125712260 + 125712261.

It is an arithmetic number, because the mean of its divisors is an integer number (125712261).

Almost surely, 2^251424521 is an apocalyptic number.

It is an amenable number.

251424521 is a deficient number, since it is larger than the sum of its proper divisors (1).

251424521 is an equidigital number, since it uses as much as digits as its factorization.

251424521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3200, while the sum is 26.

The square root of 251424521 is about 15856.3716215280. The cubic root of 251424521 is about 631.1547821482.

Adding to 251424521 its reverse (125424152), we get a palindrome (376848673).

The spelling of 251424521 in words is "two hundred fifty-one million, four hundred twenty-four thousand, five hundred twenty-one".