42505281 has 24 divisors (see below), whose sum is σ = 75566400. Its totient is φ = 22419936.

The previous prime is 42505277. The next prime is 42505327. The reversal of 42505281 is 18250524.

It is a happy number.

It is not a de Polignac number, because 42505281 - 2² = 42505277 is a prime.

It is a super-2 number, since 2×42505281² = 3613397825777922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42505231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25131 + ... + 26768.

It is an arithmetic number, because the mean of its divisors is an integer number (3148600).

Almost surely, 2^42505281 is an apocalyptic number.

It is an amenable number.

42505281 is a deficient number, since it is larger than the sum of its proper divisors (33061119).

42505281 is a wasteful number, since it uses less digits than its factorization.

42505281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51925 (or 51922 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 42505281 is about 6519.6074268318. The cubic root of 42505281 is about 348.9910562208.

The spelling of 42505281 in words is "forty-two million, five hundred five thousand, two hundred eighty-one".