985456521 has 24 divisors (see below), whose sum is σ = 1629211584. Its totient is φ = 562278240.

The previous prime is 985456519. The next prime is 985456523. The reversal of 985456521 is 125654589.

985456521 is a `hidden beast` number, since 9 + 85 + 4 + 565 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (985456519) and next prime (985456523).

It is not a de Polignac number, because 985456521 - 2¹ = 985456519 is a prime.

It is a super-2 number, since 2×985456521² = 1942249109562846882, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (985456523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32215 + ... + 54851.

It is an arithmetic number, because the mean of its divisors is an integer number (67883816).

Almost surely, 2^985456521 is an apocalyptic number.

It is an amenable number.

985456521 is a deficient number, since it is larger than the sum of its proper divisors (643755063).

985456521 is a wasteful number, since it uses less digits than its factorization.

985456521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23341 (or 23338 counting only the distinct ones).

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

The square root of 985456521 is about 31391.9817947195. The cubic root of 985456521 is about 995.1284805009.

The spelling of 985456521 in words is "nine hundred eighty-five million, four hundred fifty-six thousand, five hundred twenty-one".