8617537821 has 12 divisors (see below), whose sum is σ = 11872657536. Its totient is φ = 5559699960.

The previous prime is 8617537807. The next prime is 8617537823. The reversal of 8617537821 is 1287357168.

It is a happy number.

It is not a de Polignac number, because 8617537821 - 2⁷ = 8617537693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8617537823) 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 11 ways as a sum of consecutive naturals, for example, 1491661 + ... + 1497426.

It is an arithmetic number, because the mean of its divisors is an integer number (989388128).

Almost surely, 2^8617537821 is an apocalyptic number.

It is an amenable number.

8617537821 is a deficient number, since it is larger than the sum of its proper divisors (3255119715).

8617537821 is a wasteful number, since it uses less digits than its factorization.

8617537821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989152 (or 2989121 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 8617537821 is about 92830.6943903793. The cubic root of 8617537821 is about 2050.1913619499.

The spelling of 8617537821 in words is "eight billion, six hundred seventeen million, five hundred thirty-seven thousand, eight hundred twenty-one".