814641985 has 4 divisors (see below), whose sum is σ = 977570388. Its totient is φ = 651713584.

The previous prime is 814641983. The next prime is 814642019. The reversal of 814641985 is 589146418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 585301249 + 229340736 = 24193^2 + 15144^2 .

It is a cyclic number.

It is not a de Polignac number, because 814641985 - 2¹ = 814641983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (814641983) 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 3 ways as a sum of consecutive naturals, for example, 81464194 + ... + 81464203.

It is an arithmetic number, because the mean of its divisors is an integer number (244392597).

Almost surely, 2^814641985 is an apocalyptic number.

It is an amenable number.

814641985 is a deficient number, since it is larger than the sum of its proper divisors (162928403).

814641985 is a wasteful number, since it uses less digits than its factorization.

814641985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162928402.

The product of its digits is 276480, while the sum is 46.

The square root of 814641985 is about 28541.9337992365. The cubic root of 814641985 is about 933.9470679209.

The spelling of 814641985 in words is "eight hundred fourteen million, six hundred forty-one thousand, nine hundred eighty-five".