821492059 has 4 divisors (see below), whose sum is σ = 822366000. Its totient is φ = 820618120.

The previous prime is 821492051. The next prime is 821492101. The reversal of 821492059 is 950294128.

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

It is a cyclic number.

It is not a de Polignac number, because 821492059 - 2³ = 821492051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821492051) by changing a digit.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435559 + ... + 437440.

It is an arithmetic number, because the mean of its divisors is an integer number (205591500).

Almost surely, 2^821492059 is an apocalyptic number.

821492059 is a deficient number, since it is larger than the sum of its proper divisors (873941).

821492059 is an equidigital number, since it uses as much as digits as its factorization.

821492059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873940.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 821492059 is about 28661.6827663695. The cubic root of 821492059 is about 936.5575226200.

The spelling of 821492059 in words is "eight hundred twenty-one million, four hundred ninety-two thousand, fifty-nine".