1616619491 has 2 divisors, whose sum is σ = 1616619492. Its totient is φ = 1616619490.

The previous prime is 1616619479. The next prime is 1616619497. The reversal of 1616619491 is 1949166161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1616619491 is a prime.

It is a super-2 number, since 2×1616619491² = 5226917157362198162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1616619497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808309745 + 808309746.

It is an arithmetic number, because the mean of its divisors is an integer number (808309746).

Almost surely, 2^1616619491 is an apocalyptic number.

1616619491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616619491 is an equidigital number, since it uses as much as digits as its factorization.

1616619491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 1616619491 is about 40207.2069534804. The cubic root of 1616619491 is about 1173.6427947315.

The spelling of 1616619491 in words is "one billion, six hundred sixteen million, six hundred nineteen thousand, four hundred ninety-one".