616159909 has 2 divisors, whose sum is σ = 616159910. Its totient is φ = 616159908.

The previous prime is 616159877. The next prime is 616159913. The reversal of 616159909 is 909951616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561547809 + 54612100 = 23697^2 + 7390^2 .

It is a cyclic number.

It is not a de Polignac number, because 616159909 - 2⁵ = 616159877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616159969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308079954 + 308079955.

It is an arithmetic number, because the mean of its divisors is an integer number (308079955).

Almost surely, 2^616159909 is an apocalyptic number.

It is an amenable number.

616159909 is a deficient number, since it is larger than the sum of its proper divisors (1).

616159909 is an equidigital number, since it uses as much as digits as its factorization.

616159909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 616159909 is about 24822.5685415511. The cubic root of 616159909 is about 850.9377926482.

The spelling of 616159909 in words is "six hundred sixteen million, one hundred fifty-nine thousand, nine hundred nine".