251328461 has 2 divisors, whose sum is σ = 251328462. Its totient is φ = 251328460.

The previous prime is 251328437. The next prime is 251328499. The reversal of 251328461 is 164823152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244922500 + 6405961 = 15650^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 251328461 - 2⁶ = 251328397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251328431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125664230 + 125664231.

It is an arithmetic number, because the mean of its divisors is an integer number (125664231).

Almost surely, 2^251328461 is an apocalyptic number.

It is an amenable number.

251328461 is a deficient number, since it is larger than the sum of its proper divisors (1).

251328461 is an equidigital number, since it uses as much as digits as its factorization.

251328461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The square root of 251328461 is about 15853.3422659072. The cubic root of 251328461 is about 631.0743916184.

The spelling of 251328461 in words is "two hundred fifty-one million, three hundred twenty-eight thousand, four hundred sixty-one".