616144391 has 2 divisors, whose sum is σ = 616144392. Its totient is φ = 616144390.

The previous prime is 616144381. The next prime is 616144421. The reversal of 616144391 is 193441616.

616144391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616144391 - 2²⁶ = 549035527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616144301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308072195 + 308072196.

It is an arithmetic number, because the mean of its divisors is an integer number (308072196).

Almost surely, 2^616144391 is an apocalyptic number.

616144391 is a deficient number, since it is larger than the sum of its proper divisors (1).

616144391 is an equidigital number, since it uses as much as digits as its factorization.

616144391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 616144391 is about 24822.2559611329. The cubic root of 616144391 is about 850.9306489596.

The spelling of 616144391 in words is "six hundred sixteen million, one hundred forty-four thousand, three hundred ninety-one".