821082545 has 4 divisors (see below), whose sum is σ = 985299060. Its totient is φ = 656866032.

The previous prime is 821082533. The next prime is 821082547. The reversal of 821082545 is 545280128.

It is a happy number.

821082545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 638724529 + 182358016 = 25273^2 + 13504^2 .

It is a cyclic number.

It is not a de Polignac number, because 821082545 - 2²⁴ = 804305329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (821082547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82108250 + ... + 82108259.

It is an arithmetic number, because the mean of its divisors is an integer number (246324765).

Almost surely, 2^821082545 is an apocalyptic number.

It is an amenable number.

821082545 is a deficient number, since it is larger than the sum of its proper divisors (164216515).

821082545 is a wasteful number, since it uses less digits than its factorization.

821082545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164216514.

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 821082545 is about 28654.5379477667. The cubic root of 821082545 is about 936.4018720323.

The spelling of 821082545 in words is "eight hundred twenty-one million, eighty-two thousand, five hundred forty-five".