616644949 has 2 divisors, whose sum is σ = 616644950. Its totient is φ = 616644948.

The previous prime is 616644947. The next prime is 616644953. The reversal of 616644949 is 949446616.

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., 517244049 + 99400900 = 22743^2 + 9970^2 .

It is a cyclic number.

It is not a de Polignac number, because 616644949 - 2¹ = 616644947 is a prime.

Together with 616644947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616644947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308322474 + 308322475.

It is an arithmetic number, because the mean of its divisors is an integer number (308322475).

Almost surely, 2^616644949 is an apocalyptic number.

It is an amenable number.

616644949 is a deficient number, since it is larger than the sum of its proper divisors (1).

616644949 is an equidigital number, since it uses as much as digits as its factorization.

616644949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 49.

The square root of 616644949 is about 24832.3367607642. The cubic root of 616644949 is about 851.1610196632.

It can be divided in two parts, 6166 and 44949, that added together give a palindrome (51115).

The spelling of 616644949 in words is "six hundred sixteen million, six hundred forty-four thousand, nine hundred forty-nine".