42531505 has 8 divisors (see below), whose sum is σ = 51490152. Its totient is φ = 33723648.

The previous prime is 42531499. The next prime is 42531509. The reversal of 42531505 is 50513524.

42531505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1520289 + 41011216 = 1233^2 + 6404^2 .

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 42531505 - 2³ = 42531497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42531505.

It is not an unprimeable number, because it can be changed into a prime (42531509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37074 + ... + 38203.

It is an arithmetic number, because the mean of its divisors is an integer number (6436269).

Almost surely, 2^42531505 is an apocalyptic number.

It is an amenable number.

42531505 is a deficient number, since it is larger than the sum of its proper divisors (8958647).

42531505 is a wasteful number, since it uses less digits than its factorization.

42531505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75395.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 42531505 is about 6521.6182807644. The cubic root of 42531505 is about 349.0628124808.

The spelling of 42531505 in words is "forty-two million, five hundred thirty-one thousand, five hundred five".