42203561 has 4 divisors (see below), whose sum is σ = 42255300. Its totient is φ = 42151824.

The previous prime is 42203549. The next prime is 42203599. The reversal of 42203561 is 16530224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17799961 + 24403600 = 4219^2 + 4940^2 .

It is a cyclic number.

It is not a de Polignac number, because 42203561 - 2¹⁴ = 42187177 is a prime.

It is a super-3 number, since 3×42203561³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42203531) 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, 24626 + ... + 26283.

It is an arithmetic number, because the mean of its divisors is an integer number (10563825).

Almost surely, 2^42203561 is an apocalyptic number.

It is an amenable number.

42203561 is a deficient number, since it is larger than the sum of its proper divisors (51739).

42203561 is an equidigital number, since it uses as much as digits as its factorization.

42203561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51738.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 42203561 is about 6496.4267870884. The cubic root of 42203561 is about 348.1633338394.

Adding to 42203561 its reverse (16530224), we get a palindrome (58733785).

The spelling of 42203561 in words is "forty-two million, two hundred three thousand, five hundred sixty-one".