616408549 has 2 divisors, whose sum is σ = 616408550. Its totient is φ = 616408548.

The previous prime is 616408501. The next prime is 616408553. The reversal of 616408549 is 945804616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582884449 + 33524100 = 24143^2 + 5790^2 .

It is a cyclic number.

It is not a de Polignac number, because 616408549 - 2⁷ = 616408421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616400549) 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, 308204274 + 308204275.

It is an arithmetic number, because the mean of its divisors is an integer number (308204275).

Almost surely, 2^616408549 is an apocalyptic number.

It is an amenable number.

616408549 is a deficient number, since it is larger than the sum of its proper divisors (1).

616408549 is an equidigital number, since it uses as much as digits as its factorization.

616408549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 616408549 is about 24827.5763819186. The cubic root of 616408549 is about 851.0522373546.

The spelling of 616408549 in words is "six hundred sixteen million, four hundred eight thousand, five hundred forty-nine".