616591231 has 2 divisors, whose sum is σ = 616591232. Its totient is φ = 616591230.

The previous prime is 616591229. The next prime is 616591253. The reversal of 616591231 is 132195616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616591231 - 2¹ = 616591229 is a prime.

It is a super-3 number, since 3×616591231³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 616591229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616591201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308295615 + 308295616.

It is an arithmetic number, because the mean of its divisors is an integer number (308295616).

Almost surely, 2^616591231 is an apocalyptic number.

616591231 is a deficient number, since it is larger than the sum of its proper divisors (1).

616591231 is an equidigital number, since it uses as much as digits as its factorization.

616591231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 616591231 is about 24831.2551233320. The cubic root of 616591231 is about 851.1363031196.

The spelling of 616591231 in words is "six hundred sixteen million, five hundred ninety-one thousand, two hundred thirty-one".