1616559949 has 2 divisors, whose sum is σ = 1616559950. Its totient is φ = 1616559948.

The previous prime is 1616559947. The next prime is 1616560027. The reversal of 1616559949 is 9499556161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985646025 + 630913924 = 31395^2 + 25118^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616559949 - 2¹ = 1616559947 is a prime.

It is a super-2 number, since 2×1616559949² = 5226532137421765202, which contains 22 as substring.

Together with 1616559947, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1616559949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616559941) 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 as a sum of consecutive naturals, namely, 808279974 + 808279975.

It is an arithmetic number, because the mean of its divisors is an integer number (808279975).

Almost surely, 2^1616559949 is an apocalyptic number.

It is an amenable number.

1616559949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616559949 is an equidigital number, since it uses as much as digits as its factorization.

1616559949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2624400, while the sum is 55.

The square root of 1616559949 is about 40206.4665072672. The cubic root of 1616559949 is about 1173.6283856724.

The spelling of 1616559949 in words is "one billion, six hundred sixteen million, five hundred fifty-nine thousand, nine hundred forty-nine".