4320661 has 4 divisors (see below), whose sum is σ = 4325824. Its totient is φ = 4315500.

The previous prime is 4320643. The next prime is 4320689. The reversal of 4320661 is 1660234.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1660234 = 2 ⋅830117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4320661 is a prime.

It is a super-2 number, since 2×4320661² = 37336222953842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4320061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005 + ... + 3106.

It is an arithmetic number, because the mean of its divisors is an integer number (1081456).

Almost surely, 2^4320661 is an apocalyptic number.

It is an amenable number.

4320661 is a deficient number, since it is larger than the sum of its proper divisors (5163).

4320661 is a wasteful number, since it uses less digits than its factorization.

4320661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5162.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 4320661 is about 2078.6199748872. The cubic root of 4320661 is about 162.8733631926.

Adding to 4320661 its reverse (1660234), we get a palindrome (5980895).

The spelling of 4320661 in words is "four million, three hundred twenty thousand, six hundred sixty-one".