42102545 has 4 divisors (see below), whose sum is σ = 50523060. Its totient is φ = 33682032.

The previous prime is 42102539. The next prime is 42102563. The reversal of 42102545 is 54520124.

It is a happy number.

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 26790976 + 15311569 = 5176^2 + 3913^2 .

It is a cyclic number.

It is not a de Polignac number, because 42102545 - 2⁶ = 42102481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42102545.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4210250 + ... + 4210259.

It is an arithmetic number, because the mean of its divisors is an integer number (12630765).

Almost surely, 2^42102545 is an apocalyptic number.

It is an amenable number.

42102545 is a deficient number, since it is larger than the sum of its proper divisors (8420515).

42102545 is an equidigital number, since it uses as much as digits as its factorization.

42102545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8420514.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42102545 is about 6488.6473937177. The cubic root of 42102545 is about 347.8853307182.

Adding to 42102545 its reverse (54520124), we get a palindrome (96622669).

The spelling of 42102545 in words is "forty-two million, one hundred two thousand, five hundred forty-five".