251130871 has 2 divisors, whose sum is σ = 251130872. Its totient is φ = 251130870.

The previous prime is 251130827. The next prime is 251130881. The reversal of 251130871 is 178031152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251130871 - 2¹⁹ = 250606583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251130881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125565435 + 125565436.

It is an arithmetic number, because the mean of its divisors is an integer number (125565436).

Almost surely, 2^251130871 is an apocalyptic number.

251130871 is a deficient number, since it is larger than the sum of its proper divisors (1).

251130871 is an equidigital number, since it uses as much as digits as its factorization.

251130871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 251130871 is about 15847.1092316548. The cubic root of 251130871 is about 630.9089684105.

The spelling of 251130871 in words is "two hundred fifty-one million, one hundred thirty thousand, eight hundred seventy-one".