616291 has 4 divisors (see below), whose sum is σ = 663712. Its totient is φ = 568872.

The previous prime is 616289. The next prime is 616307. The reversal of 616291 is 192616.

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 616291 - 2¹ = 616289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616211) 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, 23691 + ... + 23716.

It is an arithmetic number, because the mean of its divisors is an integer number (165928).

2⁶¹⁶²⁹¹ is an apocalyptic number.

616291 is a deficient number, since it is larger than the sum of its proper divisors (47421).

616291 is a wasteful number, since it uses less digits than its factorization.

616291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47420.

The product of its digits is 648, while the sum is 25.

The square root of 616291 is about 785.0420370910. The cubic root of 616291 is about 85.0998135412.

The spelling of 616291 in words is "six hundred sixteen thousand, two hundred ninety-one".