4636661 has 2 divisors, whose sum is σ = 4636662. Its totient is φ = 4636660.

The previous prime is 4636657. The next prime is 4636663. The reversal of 4636661 is 1666364.

Added to its reverse (1666364) it gives a triangular number (6303025 = T₃₅₅₀).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4622500 + 14161 = 2150^2 + 119^2 .

It is a cyclic number.

It is not a de Polignac number, because 4636661 - 2² = 4636657 is a prime.

It is a Sophie Germain prime.

Together with 4636663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4636663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2318330 + 2318331.

It is an arithmetic number, because the mean of its divisors is an integer number (2318331).

Almost surely, 2^4636661 is an apocalyptic number.

It is an amenable number.

4636661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4636661 is an equidigital number, since it uses as much as digits as its factorization.

4636661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 4636661 is about 2153.2907374528. The cubic root of 4636661 is about 166.7510004308.

Adding to 4636661 its reverse (1666364), we get a triangular number (6303025 = T₃₅₅₀).

The spelling of 4636661 in words is "four million, six hundred thirty-six thousand, six hundred sixty-one".