251380847 has 2 divisors, whose sum is σ = 251380848. Its totient is φ = 251380846.

The previous prime is 251380837. The next prime is 251380859. The reversal of 251380847 is 748083152.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251380847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251380847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251380837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125690423 + 125690424.

It is an arithmetic number, because the mean of its divisors is an integer number (125690424).

Almost surely, 2^251380847 is an apocalyptic number.

251380847 is a deficient number, since it is larger than the sum of its proper divisors (1).

251380847 is an equidigital number, since it uses as much as digits as its factorization.

251380847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 251380847 is about 15854.9943866278. The cubic root of 251380847 is about 631.1182348641.

The spelling of 251380847 in words is "two hundred fifty-one million, three hundred eighty thousand, eight hundred forty-seven".