855946521 has 10 divisors (see below), whose sum is σ = 1278636282. Its totient is φ = 570630960.

The previous prime is 855946517. The next prime is 855946543. The reversal of 855946521 is 125649558.

855946521 is a `hidden beast` number, since 8 + 5 + 594 + 6 + 52 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 743162121 + 112784400 = 27261^2 + 10620^2 .

It is not a de Polignac number, because 855946521 - 2² = 855946517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855946121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5283540 + ... + 5283701.

Almost surely, 2^855946521 is an apocalyptic number.

855946521 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

855946521 is a deficient number, since it is larger than the sum of its proper divisors (422689761).

855946521 is a wasteful number, since it uses less digits than its factorization.

855946521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10567253 (or 10567244 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 855946521 is about 29256.5637250857. The cubic root of 855946521 is about 949.4721059766.

It can be divided in two parts, 855 and 946521, that added together give a triangular number (947376 = T₁₃₇₆).

The spelling of 855946521 in words is "eight hundred fifty-five million, nine hundred forty-six thousand, five hundred twenty-one".