611563 has 4 divisors (see below), whose sum is σ = 614008. Its totient is φ = 609120.

The previous prime is 611561. The next prime is 611587. The reversal of 611563 is 365116.

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

It is a cyclic number.

It is not a de Polignac number, because 611563 - 2¹ = 611561 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (153502).

2⁶¹¹⁵⁶³ is an apocalyptic number.

611563 is a deficient number, since it is larger than the sum of its proper divisors (2445).

611563 is a wasteful number, since it uses less digits than its factorization.

611563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444.

The product of its digits is 540, while the sum is 22.

The square root of 611563 is about 782.0249356638. The cubic root of 611563 is about 84.8816345565.

Adding to 611563 its reverse (365116), we get a palindrome (976679).

It can be divided in two parts, 6 and 11563, that multiplied together give a triangular number (69378 = T₃₇₂).

The spelling of 611563 in words is "six hundred eleven thousand, five hundred sixty-three".