827892561 has 4 divisors (see below), whose sum is σ = 1103856752. Its totient is φ = 551928372.

The previous prime is 827892539. The next prime is 827892563. The reversal of 827892561 is 165298728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 827892561 - 2⁶ = 827892497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 827892561.

It is not an unprimeable number, because it can be changed into a prime (827892563) 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, 137982091 + ... + 137982096.

It is an arithmetic number, because the mean of its divisors is an integer number (275964188).

Almost surely, 2^827892561 is an apocalyptic number.

It is an amenable number.

827892561 is a deficient number, since it is larger than the sum of its proper divisors (275964191).

827892561 is a wasteful number, since it uses less digits than its factorization.

827892561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275964190.

The product of its digits is 483840, while the sum is 48.

The square root of 827892561 is about 28773.1221976344. The cubic root of 827892561 is about 938.9835704793.

The spelling of 827892561 in words is "eight hundred twenty-seven million, eight hundred ninety-two thousand, five hundred sixty-one".