451616985 has 64 divisors (see below), whose sum is σ = 894931200. Its totient is φ = 214742016.

The previous prime is 451616939. The next prime is 451616987. The reversal of 451616985 is 589616154.

451616985 is a `hidden beast` number, since 451 + 61 + 69 + 85 = 666.

It is not a de Polignac number, because 451616985 - 2¹⁰ = 451615961 is a prime.

It is a super-2 number, since 2×451616985² = 407915802280980450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 451616985.

It is not an unprimeable number, because it can be changed into a prime (451616987) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38427 + ... + 48783.

It is an arithmetic number, because the mean of its divisors is an integer number (13983300).

Almost surely, 2^451616985 is an apocalyptic number.

451616985 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

451616985 is a deficient number, since it is larger than the sum of its proper divisors (443314215).

451616985 is a wasteful number, since it uses less digits than its factorization.

451616985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10407 (or 10401 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 451616985 is about 21251.2819613312. The cubic root of 451616985 is about 767.2261950955.

The spelling of 451616985 in words is "four hundred fifty-one million, six hundred sixteen thousand, nine hundred eighty-five".