4861661 has 4 divisors (see below), whose sum is σ = 5556192. Its totient is φ = 4167132.

The previous prime is 4861631. The next prime is 4861667. The reversal of 4861661 is 1661684.

4861661 = T₄₆₀ + T₄₆₁ + ... + T₅₀₁.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4861661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4861667) 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 in 3 ways as a sum of consecutive naturals, for example, 347255 + ... + 347268.

It is an arithmetic number, because the mean of its divisors is an integer number (1389048).

Almost surely, 2^4861661 is an apocalyptic number.

It is an amenable number.

4861661 is a deficient number, since it is larger than the sum of its proper divisors (694531).

4861661 is an equidigital number, since it uses as much as digits as its factorization.

4861661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694530.

The product of its digits is 6912, while the sum is 32.

The square root of 4861661 is about 2204.9174587726. The cubic root of 4861661 is about 169.4057800481.

The spelling of 4861661 in words is "four million, eight hundred sixty-one thousand, six hundred sixty-one".