251351047 has 2 divisors, whose sum is σ = 251351048. Its totient is φ = 251351046.

The previous prime is 251350997. The next prime is 251351063. The reversal of 251351047 is 740153152.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251351047 - 2¹⁵ = 251318279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251351447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125675523 + 125675524.

It is an arithmetic number, because the mean of its divisors is an integer number (125675524).

Almost surely, 2^251351047 is an apocalyptic number.

251351047 is a deficient number, since it is larger than the sum of its proper divisors (1).

251351047 is an equidigital number, since it uses as much as digits as its factorization.

251351047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 251351047 is about 15854.0545918071. The cubic root of 251351047 is about 631.0932951934.

The spelling of 251351047 in words is "two hundred fifty-one million, three hundred fifty-one thousand, forty-seven".