42561617 has 4 divisors (see below), whose sum is σ = 48641856. Its totient is φ = 36481380.

The previous prime is 42561613. The next prime is 42561619. The reversal of 42561617 is 71616524.

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.

It is a cyclic number.

It is not a de Polignac number, because 42561617 - 2² = 42561613 is a prime.

It is a super-2 number, since 2×42561617² = 3622982483309378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42561611) 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, 3040109 + ... + 3040122.

It is an arithmetic number, because the mean of its divisors is an integer number (12160464).

Almost surely, 2^42561617 is an apocalyptic number.

It is an amenable number.

42561617 is a deficient number, since it is larger than the sum of its proper divisors (6080239).

42561617 is an equidigital number, since it uses as much as digits as its factorization.

42561617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080238.

The product of its digits is 10080, while the sum is 32.

The square root of 42561617 is about 6523.9265017319. The cubic root of 42561617 is about 349.1451710353.

The spelling of 42561617 in words is "forty-two million, five hundred sixty-one thousand, six hundred seventeen".