616661239 has 2 divisors, whose sum is σ = 616661240. Its totient is φ = 616661238.

The previous prime is 616661189. The next prime is 616661317. The reversal of 616661239 is 932166616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616661239 - 2²¹ = 614564087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616601239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308330619 + 308330620.

It is an arithmetic number, because the mean of its divisors is an integer number (308330620).

Almost surely, 2^616661239 is an apocalyptic number.

616661239 is a deficient number, since it is larger than the sum of its proper divisors (1).

616661239 is an equidigital number, since it uses as much as digits as its factorization.

616661239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 616661239 is about 24832.6647583380. The cubic root of 616661239 is about 851.1685146790.

The spelling of 616661239 in words is "six hundred sixteen million, six hundred sixty-one thousand, two hundred thirty-nine".