616997 has 2 divisors, whose sum is σ = 616998. Its totient is φ = 616996.

The previous prime is 616991. The next prime is 616999. The reversal of 616997 is 799616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410881 + 206116 = 641^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 616997 - 2⁶ = 616933 is a prime.

Together with 616999, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308498 + 308499.

It is an arithmetic number, because the mean of its divisors is an integer number (308499).

2⁶¹⁶⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

616997 is a deficient number, since it is larger than the sum of its proper divisors (1).

616997 is an equidigital number, since it uses as much as digits as its factorization.

616997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 616997 is about 785.4915658363. The cubic root of 616997 is about 85.1322968654.

The spelling of 616997 in words is "six hundred sixteen thousand, nine hundred ninety-seven".