6610861 has 2 divisors, whose sum is σ = 6610862. Its totient is φ = 6610860.

The previous prime is 6610859. The next prime is 6610883. The reversal of 6610861 is 1680166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4435236 + 2175625 = 2106^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 6610861 - 2¹ = 6610859 is a prime.

It is a super-2 number, since 2×6610861² = 87406966322642, which contains 22 as substring.

Together with 6610859, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6610801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305430 + 3305431.

It is an arithmetic number, because the mean of its divisors is an integer number (3305431).

Almost surely, 2^6610861 is an apocalyptic number.

It is an amenable number.

6610861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6610861 is an equidigital number, since it uses as much as digits as its factorization.

6610861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 6610861 is about 2571.1594660775. The cubic root of 6610861 is about 187.6805821727.

The spelling of 6610861 in words is "six million, six hundred ten thousand, eight hundred sixty-one".