4171561 has 4 divisors (see below), whose sum is σ = 4177152. Its totient is φ = 4165972.

The previous prime is 4171547. The next prime is 4171591. The reversal of 4171561 is 1651714.

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: 1651714 = 2 ⋅825857.

It is a cyclic number.

It is not a de Polignac number, because 4171561 - 2¹¹ = 4169513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4171591) 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, 1465 + ... + 3238.

It is an arithmetic number, because the mean of its divisors is an integer number (1044288).

Almost surely, 2^4171561 is an apocalyptic number.

It is an amenable number.

4171561 is a deficient number, since it is larger than the sum of its proper divisors (5591).

4171561 is an equidigital number, since it uses as much as digits as its factorization.

4171561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590.

The product of its digits is 840, while the sum is 25.

The square root of 4171561 is about 2042.4399623979. The cubic root of 4171561 is about 160.9778784724.

The spelling of 4171561 in words is "four million, one hundred seventy-one thousand, five hundred sixty-one".