8549499839 has 2 divisors, whose sum is σ = 8549499840. Its totient is φ = 8549499838.

The previous prime is 8549499799. The next prime is 8549499857. The reversal of 8549499839 is 9389949458.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8549499839 is a prime.

It is a super-2 number, since 2×8549499839² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8549499899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4274749919 + 4274749920.

It is an arithmetic number, because the mean of its divisors is an integer number (4274749920).

Almost surely, 2^8549499839 is an apocalyptic number.

8549499839 is a deficient number, since it is larger than the sum of its proper divisors (1).

8549499839 is an equidigital number, since it uses as much as digits as its factorization.

8549499839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100776960, while the sum is 68.

The square root of 8549499839 is about 92463.5054440399. The cubic root of 8549499839 is about 2044.7814791523.

The spelling of 8549499839 in words is "eight billion, five hundred forty-nine million, four hundred ninety-nine thousand, eight hundred thirty-nine".