42561957 has 16 divisors (see below), whose sum is σ = 60720320. Its totient is φ = 26438400.

The previous prime is 42561941. The next prime is 42561971. The reversal of 42561957 is 75916524.

It is not a de Polignac number, because 42561957 - 2⁴ = 42561941 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 (42561907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2644 + ... + 9597.

It is an arithmetic number, because the mean of its divisors is an integer number (3795020).

Almost surely, 2^42561957 is an apocalyptic number.

It is an amenable number.

42561957 is a deficient number, since it is larger than the sum of its proper divisors (18158363).

42561957 is a wasteful number, since it uses less digits than its factorization.

42561957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12324.

The product of its digits is 75600, while the sum is 39.

The square root of 42561957 is about 6523.9525596068. The cubic root of 42561957 is about 349.1461007387.

The spelling of 42561957 in words is "forty-two million, five hundred sixty-one thousand, nine hundred fifty-seven".