616505189 has 2 divisors, whose sum is σ = 616505190. Its totient is φ = 616505188.

The previous prime is 616505173. The next prime is 616505191. The reversal of 616505189 is 981505616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544848964 + 71656225 = 23342^2 + 8465^2 .

It is a cyclic number.

It is not a de Polignac number, because 616505189 - 2⁴ = 616505173 is a prime.

Together with 616505191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616505129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308252594 + 308252595.

It is an arithmetic number, because the mean of its divisors is an integer number (308252595).

Almost surely, 2^616505189 is an apocalyptic number.

It is an amenable number.

616505189 is a deficient number, since it is larger than the sum of its proper divisors (1).

616505189 is an equidigital number, since it uses as much as digits as its factorization.

616505189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 616505189 is about 24829.5225286351. The cubic root of 616505189 is about 851.0967107755.

The spelling of 616505189 in words is "six hundred sixteen million, five hundred five thousand, one hundred eighty-nine".