42561751 has 4 divisors (see below), whose sum is σ = 42576192. Its totient is φ = 42547312.

The previous prime is 42561749. The next prime is 42561773. The reversal of 42561751 is 15716524.

42561751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42561751 - 2¹ = 42561749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42561551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1030 + ... + 9283.

It is an arithmetic number, because the mean of its divisors is an integer number (10644048).

Almost surely, 2^42561751 is an apocalyptic number.

42561751 is a deficient number, since it is larger than the sum of its proper divisors (14441).

42561751 is a wasteful number, since it uses less digits than its factorization.

42561751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14440.

The product of its digits is 8400, while the sum is 31.

The square root of 42561751 is about 6523.9367716127. The cubic root of 42561751 is about 349.1455374484.

The spelling of 42561751 in words is "forty-two million, five hundred sixty-one thousand, seven hundred fifty-one".