616495991 has 2 divisors, whose sum is σ = 616495992. Its totient is φ = 616495990.

The previous prime is 616495987. The next prime is 616496047. The reversal of 616495991 is 199594616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616495991 - 2² = 616495987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616495921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308247995 + 308247996.

It is an arithmetic number, because the mean of its divisors is an integer number (308247996).

Almost surely, 2^616495991 is an apocalyptic number.

616495991 is a deficient number, since it is larger than the sum of its proper divisors (1).

616495991 is an equidigital number, since it uses as much as digits as its factorization.

616495991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 50.

The square root of 616495991 is about 24829.3373048900. The cubic root of 616495991 is about 851.0924780853.

The spelling of 616495991 in words is "six hundred sixteen million, four hundred ninety-five thousand, nine hundred ninety-one".