4311661 has 4 divisors (see below), whose sum is σ = 4384800. Its totient is φ = 4238524.

The previous prime is 4311631. The next prime is 4311667. The reversal of 4311661 is 1661134.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1661134 = 2 ⋅830567.

It is a cyclic number.

It is not a de Polignac number, because 4311661 - 2⁷ = 4311533 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 (4311667) 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 in 3 ways as a sum of consecutive naturals, for example, 36481 + ... + 36598.

It is an arithmetic number, because the mean of its divisors is an integer number (1096200).

Almost surely, 2^4311661 is an apocalyptic number.

It is an amenable number.

4311661 is a deficient number, since it is larger than the sum of its proper divisors (73139).

4311661 is an equidigital number, since it uses as much as digits as its factorization.

4311661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73138.

The product of its digits is 432, while the sum is 22.

The square root of 4311661 is about 2076.4539484419. The cubic root of 4311661 is about 162.7601953810.

Adding to 4311661 its reverse (1661134), we get a palindrome (5972795).

The spelling of 4311661 in words is "four million, three hundred eleven thousand, six hundred sixty-one".