4145661 has 40 divisors (see below), whose sum is σ = 6938624. Its totient is φ = 2449440.

The previous prime is 4145653. The next prime is 4145677. The reversal of 4145661 is 1665414.

It is not a de Polignac number, because 4145661 - 2³ = 4145653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

4145661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4145611) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32580 + ... + 32706.

Almost surely, 2^4145661 is an apocalyptic number.

It is an amenable number.

4145661 is a deficient number, since it is larger than the sum of its proper divisors (2792963).

4145661 is a wasteful number, since it uses less digits than its factorization.

4145661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 174 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 4145661 is about 2036.0896345692. The cubic root of 4145661 is about 160.6440317702.

The spelling of 4145661 in words is "four million, one hundred forty-five thousand, six hundred sixty-one".