8523686821 has 8 divisors (see below), whose sum is σ = 9183230840. Its totient is φ = 7864696512.

The previous prime is 8523686813. The next prime is 8523686861. The reversal of 8523686821 is 1286863258.

It can be written as a sum of positive squares in 4 ways, for example, as 17313921 + 8506372900 = 4161^2 + 92230^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8523686821 - 2³ = 8523686813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8523686861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106170 + ... + 168283.

It is an arithmetic number, because the mean of its divisors is an integer number (1147903855).

Almost surely, 2^8523686821 is an apocalyptic number.

It is an amenable number.

8523686821 is a deficient number, since it is larger than the sum of its proper divisors (659544019).

8523686821 is a wasteful number, since it uses less digits than its factorization.

8523686821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276855.

The product of its digits is 1105920, while the sum is 49.

The square root of 8523686821 is about 92323.8150262434. The cubic root of 8523686821 is about 2042.7215071482.

The spelling of 8523686821 in words is "eight billion, five hundred twenty-three million, six hundred eighty-six thousand, eight hundred twenty-one".