611563609 has 2 divisors, whose sum is σ = 611563610. Its totient is φ = 611563608.

The previous prime is 611563607. The next prime is 611563619. The reversal of 611563609 is 906365116.

611563609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556016400 + 55547209 = 23580^2 + 7453^2 .

It is a cyclic number.

It is not a de Polignac number, because 611563609 - 2¹ = 611563607 is a prime.

Together with 611563607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (611563607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305781804 + 305781805.

It is an arithmetic number, because the mean of its divisors is an integer number (305781805).

Almost surely, 2^611563609 is an apocalyptic number.

It is an amenable number.

611563609 is a deficient number, since it is larger than the sum of its proper divisors (1).

611563609 is an equidigital number, since it uses as much as digits as its factorization.

611563609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 611563609 is about 24729.8121505199. The cubic root of 611563609 is about 848.8166273178.

The spelling of 611563609 in words is "six hundred eleven million, five hundred sixty-three thousand, six hundred nine".