251454221 has 2 divisors, whose sum is σ = 251454222. Its totient is φ = 251454220.

The previous prime is 251454199. The next prime is 251454223. The reversal of 251454221 is 122454152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171976996 + 79477225 = 13114^2 + 8915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251454221 is a prime.

Together with 251454223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251454223) 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, 125727110 + 125727111.

It is an arithmetic number, because the mean of its divisors is an integer number (125727111).

Almost surely, 2^251454221 is an apocalyptic number.

It is an amenable number.

251454221 is a deficient number, since it is larger than the sum of its proper divisors (1).

251454221 is an equidigital number, since it uses as much as digits as its factorization.

251454221 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 251454221 is about 15857.3081259084. The cubic root of 251454221 is about 631.1796332896.

The spelling of 251454221 in words is "two hundred fifty-one million, four hundred fifty-four thousand, two hundred twenty-one".