251428841 has 2 divisors, whose sum is σ = 251428842. Its totient is φ = 251428840.

The previous prime is 251428813. The next prime is 251428937. The reversal of 251428841 is 148824152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251064025 + 364816 = 15845^2 + 604^2 .

It is a cyclic number.

It is not a de Polignac number, because 251428841 - 2⁶ = 251428777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (251428141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125714420 + 125714421.

It is an arithmetic number, because the mean of its divisors is an integer number (125714421).

Almost surely, 2^251428841 is an apocalyptic number.

It is an amenable number.

251428841 is a deficient number, since it is larger than the sum of its proper divisors (1).

251428841 is an equidigital number, since it uses as much as digits as its factorization.

251428841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20480, while the sum is 35.

The square root of 251428841 is about 15856.5078437845. The cubic root of 251428841 is about 631.1583969813.

The spelling of 251428841 in words is "two hundred fifty-one million, four hundred twenty-eight thousand, eight hundred forty-one".