616643 has 2 divisors, whose sum is σ = 616644. Its totient is φ = 616642.

The previous prime is 616639. The next prime is 616669. The reversal of 616643 is 346616.

It is an a-pointer prime, because the next prime (616669) can be obtained adding 616643 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616643 - 2² = 616639 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (616673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308321 + 308322.

It is an arithmetic number, because the mean of its divisors is an integer number (308322).

2⁶¹⁶⁶⁴³ is an apocalyptic number.

616643 is a deficient number, since it is larger than the sum of its proper divisors (1).

616643 is an equidigital number, since it uses as much as digits as its factorization.

616643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 616643 is about 785.2661969040. The cubic root of 616643 is about 85.1160122921.

The spelling of 616643 in words is "six hundred sixteen thousand, six hundred forty-three".