860655391 has 2 divisors, whose sum is σ = 860655392. Its totient is φ = 860655390.

The previous prime is 860655349. The next prime is 860655403. The reversal of 860655391 is 193556068.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 860655391 - 2²⁵ = 827100959 is a prime.

It is equal to p_44099647 and since 860655391 and 44099647 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is a weakly prime.

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, 430327695 + 430327696.

It is an arithmetic number, because the mean of its divisors is an integer number (430327696).

Almost surely, 2^860655391 is an apocalyptic number.

860655391 is a deficient number, since it is larger than the sum of its proper divisors (1).

860655391 is an equidigital number, since it uses as much as digits as its factorization.

860655391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 860655391 is about 29336.9287929054. The cubic root of 860655391 is about 951.2100521454.

The spelling of 860655391 in words is "eight hundred sixty million, six hundred fifty-five thousand, three hundred ninety-one".