4851661 has 2 divisors, whose sum is σ = 4851662. Its totient is φ = 4851660.

The previous prime is 4851659. The next prime is 4851683. The reversal of 4851661 is 1661584.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4813636 + 38025 = 2194^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 4851661 - 2¹ = 4851659 is a prime.

It is a super-2 number, since 2×4851661² = 47077228917842, which contains 22 as substring.

Together with 4851659, it forms a pair of twin primes.

4851661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4851761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2425830 + 2425831.

It is an arithmetic number, because the mean of its divisors is an integer number (2425831).

Almost surely, 2^4851661 is an apocalyptic number.

It is an amenable number.

4851661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4851661 is an equidigital number, since it uses as much as digits as its factorization.

4851661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 4851661 is about 2202.6486328963. The cubic root of 4851661 is about 169.2895494952.

The spelling of 4851661 in words is "four million, eight hundred fifty-one thousand, six hundred sixty-one".