42505187 has 2 divisors, whose sum is σ = 42505188. Its totient is φ = 42505186.

The previous prime is 42505181. The next prime is 42505207. The reversal of 42505187 is 78150524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42505187 - 2⁴ = 42505171 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (42505181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21252593 + 21252594.

It is an arithmetic number, because the mean of its divisors is an integer number (21252594).

Almost surely, 2^42505187 is an apocalyptic number.

42505187 is a deficient number, since it is larger than the sum of its proper divisors (1).

42505187 is an equidigital number, since it uses as much as digits as its factorization.

42505187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 42505187 is about 6519.6002178048. The cubic root of 42505187 is about 348.9907989572.

The spelling of 42505187 in words is "forty-two million, five hundred five thousand, one hundred eighty-seven".