42528181 has 8 divisors (see below), whose sum is σ = 44086680. Its totient is φ = 40975872.

The previous prime is 42528179. The next prime is 42528197. The reversal of 42528181 is 18182524.

It can be written as a sum of positive squares in 4 ways, for example, as 13205956 + 29322225 = 3634^2 + 5415^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42528181 - 2¹ = 42528179 is a prime.

It is a super-2 number, since 2×42528181² = 3617292358337522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42528151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15961 + ... + 18433.

It is an arithmetic number, because the mean of its divisors is an integer number (5510835).

Almost surely, 2^42528181 is an apocalyptic number.

It is an amenable number.

42528181 is a deficient number, since it is larger than the sum of its proper divisors (1558499).

42528181 is a wasteful number, since it uses less digits than its factorization.

42528181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3095.

The product of its digits is 5120, while the sum is 31.

The square root of 42528181 is about 6521.3634310626. The cubic root of 42528181 is about 349.0537187120.

The spelling of 42528181 in words is "forty-two million, five hundred twenty-eight thousand, one hundred eighty-one".