42250561 has 4 divisors (see below), whose sum is σ = 42268500. Its totient is φ = 42232624.

The previous prime is 42250531. The next prime is 42250577. The reversal of 42250561 is 16505224.

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 28143025 + 14107536 = 5305^2 + 3756^2 .

It is a cyclic number.

It is not a de Polignac number, because 42250561 - 2¹¹ = 42248513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42250501) 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, 4786 + ... + 10363.

It is an arithmetic number, because the mean of its divisors is an integer number (10567125).

Almost surely, 2^42250561 is an apocalyptic number.

It is an amenable number.

42250561 is a deficient number, since it is larger than the sum of its proper divisors (17939).

42250561 is a wasteful number, since it uses less digits than its factorization.

42250561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17938.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 42250561 is about 6500.0431537029. The cubic root of 42250561 is about 348.2925299356.

Adding to 42250561 its reverse (16505224), we get a palindrome (58755785).

The spelling of 42250561 in words is "forty-two million, two hundred fifty thousand, five hundred sixty-one".