1616561539 has 2 divisors, whose sum is σ = 1616561540. Its totient is φ = 1616561538.

The previous prime is 1616561497. The next prime is 1616561579. The reversal of 1616561539 is 9351656161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1616561539 - 2⁹ = 1616561027 is a prime.

It is a super-2 number, since 2×1616561539² = 5226542418748097042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1616561495 and 1616561504.

It is not a weakly prime, because it can be changed into another prime (1616561579) 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 as a sum of consecutive naturals, namely, 808280769 + 808280770.

It is an arithmetic number, because the mean of its divisors is an integer number (808280770).

Almost surely, 2^1616561539 is an apocalyptic number.

1616561539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616561539 is an equidigital number, since it uses as much as digits as its factorization.

1616561539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 43.

The square root of 1616561539 is about 40206.4862802011. The cubic root of 1616561539 is about 1173.6287704542.

The spelling of 1616561539 in words is "one billion, six hundred sixteen million, five hundred sixty-one thousand, five hundred thirty-nine".