1616861 has 2 divisors, whose sum is σ = 1616862. Its totient is φ = 1616860.

The previous prime is 1616851. The next prime is 1616891. The reversal of 1616861 is 1686161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1452025 + 164836 = 1205^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616861 - 2¹⁰ = 1615837 is a prime.

It is a super-2 number, since 2×1616861² = 5228478986642, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616801) 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, 808430 + 808431.

It is an arithmetic number, because the mean of its divisors is an integer number (808431).

2^1616861 is an apocalyptic number.

It is an amenable number.

1616861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616861 is an equidigital number, since it uses as much as digits as its factorization.

1616861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 1616861 is about 1271.5584925594. The cubic root of 1616861 is about 117.3701235856.

The spelling of 1616861 in words is "one million, six hundred sixteen thousand, eight hundred sixty-one".