391852871 has 2 divisors, whose sum is σ = 391852872. Its totient is φ = 391852870.

The previous prime is 391852859. The next prime is 391852913. The reversal of 391852871 is 178258193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391852871 - 2¹⁰ = 391851847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391852801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195926435 + 195926436.

It is an arithmetic number, because the mean of its divisors is an integer number (195926436).

Almost surely, 2^391852871 is an apocalyptic number.

391852871 is a deficient number, since it is larger than the sum of its proper divisors (1).

391852871 is an equidigital number, since it uses as much as digits as its factorization.

391852871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 44.

The square root of 391852871 is about 19795.2739561745. The cubic root of 391852871 is about 731.7695676234.

The spelling of 391852871 in words is "three hundred ninety-one million, eight hundred fifty-two thousand, eight hundred seventy-one".