251340241 has 4 divisors (see below), whose sum is σ = 254783332. Its totient is φ = 247897152.

The previous prime is 251340211. The next prime is 251340253. The reversal of 251340241 is 142043152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179158225 + 72182016 = 13385^2 + 8496^2 .

It is a cyclic number.

It is not a de Polignac number, because 251340241 - 2⁹ = 251339729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251340211) 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 in 3 ways as a sum of consecutive naturals, for example, 1721436 + ... + 1721581.

It is an arithmetic number, because the mean of its divisors is an integer number (63695833).

Almost surely, 2^251340241 is an apocalyptic number.

It is an amenable number.

251340241 is a deficient number, since it is larger than the sum of its proper divisors (3443091).

251340241 is an equidigital number, since it uses as much as digits as its factorization.

251340241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3443090.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 251340241 is about 15853.7137920425. The cubic root of 251340241 is about 631.0842511466.

Adding to 251340241 its reverse (142043152), we get a palindrome (393383393).

The spelling of 251340241 in words is "two hundred fifty-one million, three hundred forty thousand, two hundred forty-one".