42551285 has 16 divisors (see below), whose sum is σ = 58496256. Its totient is φ = 29107968.

The previous prime is 42551269. The next prime is 42551287. The reversal of 42551285 is 58215524.

It is a cyclic number.

It is not a de Polignac number, because 42551285 - 2⁴ = 42551269 is a prime.

It is a super-2 number, since 2×42551285² = 3621223710302450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42551287) 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, 16397 + ... + 18813.

It is an arithmetic number, because the mean of its divisors is an integer number (3656016).

Almost surely, 2^42551285 is an apocalyptic number.

It is an amenable number.

42551285 is a deficient number, since it is larger than the sum of its proper divisors (15944971).

42551285 is a wasteful number, since it uses less digits than its factorization.

42551285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932.

The product of its digits is 16000, while the sum is 32.

The square root of 42551285 is about 6523.1345992552. The cubic root of 42551285 is about 349.1169166275.

The spelling of 42551285 in words is "forty-two million, five hundred fifty-one thousand, two hundred eighty-five".