415561 has 4 divisors (see below), whose sum is σ = 418500. Its totient is φ = 412624.

The previous prime is 415559. The next prime is 415567. The reversal of 415561 is 165514.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165514 = 2 ⋅82757.

It can be written as a sum of positive squares in 2 ways, for example, as 145161 + 270400 = 381^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 415561 - 2¹ = 415559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (415567) 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, 1246 + ... + 1543.

It is an arithmetic number, because the mean of its divisors is an integer number (104625).

2⁴¹⁵⁵⁶¹ is an apocalyptic number.

It is an amenable number.

415561 is a deficient number, since it is larger than the sum of its proper divisors (2939).

415561 is a wasteful number, since it uses less digits than its factorization.

415561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938.

The product of its digits is 600, while the sum is 22.

The square root of 415561 is about 644.6402097294. The cubic root of 415561 is about 74.6239547209.

Subtracting from 415561 its reverse (165514), we obtain a cube (250047 = 63³).

The spelling of 415561 in words is "four hundred fifteen thousand, five hundred sixty-one".