4153661 has 4 divisors (see below), whose sum is σ = 4398012. Its totient is φ = 3909312.

The previous prime is 4153649. The next prime is 4153687. The reversal of 4153661 is 1663514.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1663514 = 2 ⋅831757.

It can be written as a sum of positive squares in 2 ways, for example, as 2910436 + 1243225 = 1706^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 4153661 - 2¹⁴ = 4137277 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4153661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4153561) 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, 122150 + ... + 122183.

It is an arithmetic number, because the mean of its divisors is an integer number (1099503).

Almost surely, 2^4153661 is an apocalyptic number.

It is an amenable number.

4153661 is a deficient number, since it is larger than the sum of its proper divisors (244351).

4153661 is a wasteful number, since it uses less digits than its factorization.

4153661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244350.

The product of its digits is 2160, while the sum is 26.

The square root of 4153661 is about 2038.0532377737. The cubic root of 4153661 is about 160.7472984928.

The spelling of 4153661 in words is "four million, one hundred fifty-three thousand, six hundred sixty-one".