616591 has 4 divisors (see below), whose sum is σ = 618192. Its totient is φ = 614992.

The previous prime is 616589. The next prime is 616597. The reversal of 616591 is 195616.

616591 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 616591 - 2¹ = 616589 is a prime.

It is a super-2 number, since 2×616591² = 760368922562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616597) 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, 171 + ... + 1123.

It is an arithmetic number, because the mean of its divisors is an integer number (154548).

2⁶¹⁶⁵⁹¹ is an apocalyptic number.

616591 is a deficient number, since it is larger than the sum of its proper divisors (1601).

616591 is an equidigital number, since it uses as much as digits as its factorization.

616591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600.

The product of its digits is 1620, while the sum is 28.

The square root of 616591 is about 785.2330864145. The cubic root of 616591 is about 85.1136196830.

The spelling of 616591 in words is "six hundred sixteen thousand, five hundred ninety-one".