849180391 has 2 divisors, whose sum is σ = 849180392. Its totient is φ = 849180390.

The previous prime is 849180359. The next prime is 849180403. The reversal of 849180391 is 193081948.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 849180391 - 2⁵ = 849180359 is a prime.

It is a super-2 number, since 2×849180391² = 1442214672917825762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849180331) 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, 424590195 + 424590196.

It is an arithmetic number, because the mean of its divisors is an integer number (424590196).

Almost surely, 2^849180391 is an apocalyptic number.

849180391 is a deficient number, since it is larger than the sum of its proper divisors (1).

849180391 is an equidigital number, since it uses as much as digits as its factorization.

849180391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 849180391 is about 29140.6999058019. The cubic root of 849180391 is about 946.9636727742.

The spelling of 849180391 in words is "eight hundred forty-nine million, one hundred eighty thousand, three hundred ninety-one".