251256847 has 2 divisors, whose sum is σ = 251256848. Its totient is φ = 251256846.

The previous prime is 251256827. The next prime is 251256883. The reversal of 251256847 is 748652152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251256847 - 2¹¹ = 251254799 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251256827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125628423 + 125628424.

It is an arithmetic number, because the mean of its divisors is an integer number (125628424).

Almost surely, 2^251256847 is an apocalyptic number.

251256847 is a deficient number, since it is larger than the sum of its proper divisors (1).

251256847 is an equidigital number, since it uses as much as digits as its factorization.

251256847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 40.

The square root of 251256847 is about 15851.0834645459. The cubic root of 251256847 is about 631.0144460867.

The spelling of 251256847 in words is "two hundred fifty-one million, two hundred fifty-six thousand, eight hundred forty-seven".