616408987 has 2 divisors, whose sum is σ = 616408988. Its totient is φ = 616408986.

The previous prime is 616408981. The next prime is 616409033. The reversal of 616408987 is 789804616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616408987 - 2³ = 616408979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616408987.

It is not a weakly prime, because it can be changed into another prime (616408981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308204493 + 308204494.

It is an arithmetic number, because the mean of its divisors is an integer number (308204494).

Almost surely, 2^616408987 is an apocalyptic number.

616408987 is a deficient number, since it is larger than the sum of its proper divisors (1).

616408987 is an equidigital number, since it uses as much as digits as its factorization.

616408987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 616408987 is about 24827.5852027538. The cubic root of 616408987 is about 851.0524389313.

The spelling of 616408987 in words is "six hundred sixteen million, four hundred eight thousand, nine hundred eighty-seven".