4045661 has 4 divisors (see below), whose sum is σ = 4106112. Its totient is φ = 3985212.

The previous prime is 4045633. The next prime is 4045663. The reversal of 4045661 is 1665404.

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 not a de Polignac number, because 4045661 - 2⁶ = 4045597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4045661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4045663) 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, 30125 + ... + 30258.

It is an arithmetic number, because the mean of its divisors is an integer number (1026528).

Almost surely, 2^4045661 is an apocalyptic number.

It is an amenable number.

4045661 is a deficient number, since it is larger than the sum of its proper divisors (60451).

4045661 is an equidigital number, since it uses as much as digits as its factorization.

4045661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60450.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 4045661 is about 2011.3828576380. The cubic root of 4045661 is about 159.3418406472.

The spelling of 4045661 in words is "four million, forty-five thousand, six hundred sixty-one".