856441477 has 2 divisors, whose sum is σ = 856441478. Its totient is φ = 856441476.

The previous prime is 856441429. The next prime is 856441483. The reversal of 856441477 is 774144658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 779861476 + 76580001 = 27926^2 + 8751^2 .

It is a cyclic number.

It is not a de Polignac number, because 856441477 - 2⁷ = 856441349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856445477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428220738 + 428220739.

It is an arithmetic number, because the mean of its divisors is an integer number (428220739).

Almost surely, 2^856441477 is an apocalyptic number.

It is an amenable number.

856441477 is a deficient number, since it is larger than the sum of its proper divisors (1).

856441477 is an equidigital number, since it uses as much as digits as its factorization.

856441477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752640, while the sum is 46.

The square root of 856441477 is about 29265.0213907320. The cubic root of 856441477 is about 949.6550832811.

The spelling of 856441477 in words is "eight hundred fifty-six million, four hundred forty-one thousand, four hundred seventy-seven".