42525281 has 4 divisors (see below), whose sum is σ = 43991700. Its totient is φ = 41058864.

The previous prime is 42525277. The next prime is 42525283. The reversal of 42525281 is 18252524.

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 17774656 + 24750625 = 4216^2 + 4975^2 .

It is a cyclic number.

It is not a de Polignac number, because 42525281 - 2² = 42525277 is a prime.

It is a super-2 number, since 2×42525281² = 3616799048257922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 1466389 = 42525281 / (4 + 2 + 5 + 2 + 5 + 2 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42525283) 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, 733166 + ... + 733223.

It is an arithmetic number, because the mean of its divisors is an integer number (10997925).

Almost surely, 2^42525281 is an apocalyptic number.

It is an amenable number.

42525281 is a deficient number, since it is larger than the sum of its proper divisors (1466419).

42525281 is a wasteful number, since it uses less digits than its factorization.

42525281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466418.

The product of its digits is 6400, while the sum is 29.

The square root of 42525281 is about 6521.1410811299. The cubic root of 42525281 is about 349.0457845315.

The spelling of 42525281 in words is "forty-two million, five hundred twenty-five thousand, two hundred eighty-one".