612808561 has 4 divisors (see below), whose sum is σ = 612911092. Its totient is φ = 612706032.

The previous prime is 612808531. The next prime is 612808583. The reversal of 612808561 is 165808216.

612808561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 559795600 + 53012961 = 23660^2 + 7281^2 .

It is a cyclic number.

It is not a de Polignac number, because 612808561 - 2⁵ = 612808529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 612808561.

It is not an unprimeable number, because it can be changed into a prime (612808531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41706 + ... + 54451.

It is an arithmetic number, because the mean of its divisors is an integer number (153227773).

Almost surely, 2^612808561 is an apocalyptic number.

It is an amenable number.

612808561 is a deficient number, since it is larger than the sum of its proper divisors (102531).

612808561 is an equidigital number, since it uses as much as digits as its factorization.

612808561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102530.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 612808561 is about 24754.9704301985. The cubic root of 612808561 is about 849.3922118746.

The spelling of 612808561 in words is "six hundred twelve million, eight hundred eight thousand, five hundred sixty-one".