8420837549 has 4 divisors (see below), whose sum is σ = 8421021180. Its totient is φ = 8420653920.

The previous prime is 8420837527. The next prime is 8420837573. The reversal of 8420837549 is 9457380248.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7014062500 + 1406775049 = 83750^2 + 37507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8420837549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8420837497 and 8420837506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420837519) 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, 41369 + ... + 136209.

It is an arithmetic number, because the mean of its divisors is an integer number (2105255295).

Almost surely, 2^8420837549 is an apocalyptic number.

It is an amenable number.

8420837549 is a deficient number, since it is larger than the sum of its proper divisors (183631).

8420837549 is an equidigital number, since it uses as much as digits as its factorization.

8420837549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183630.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The square root of 8420837549 is about 91765.1216367090. The cubic root of 8420837549 is about 2034.4722152308.

The spelling of 8420837549 in words is "eight billion, four hundred twenty million, eight hundred thirty-seven thousand, five hundred forty-nine".