4161561 has 8 divisors (see below), whose sum is σ = 5565120. Its totient is φ = 2766192.

The previous prime is 4161559. The next prime is 4161581. The reversal of 4161561 is 1651614.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4161561 - 2¹ = 4161559 is a prime.

4161561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4161581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741 + ... + 2978.

It is an arithmetic number, because the mean of its divisors is an integer number (695640).

Almost surely, 2^4161561 is an apocalyptic number.

It is an amenable number.

4161561 is a deficient number, since it is larger than the sum of its proper divisors (1403559).

4161561 is a wasteful number, since it uses less digits than its factorization.

4161561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4095.

The product of its digits is 720, while the sum is 24.

The square root of 4161561 is about 2039.9904411541. The cubic root of 4161561 is about 160.8491443436.

The spelling of 4161561 in words is "four million, one hundred sixty-one thousand, five hundred sixty-one".