42510009 has 4 divisors (see below), whose sum is σ = 56680016. Its totient is φ = 28340004.

The previous prime is 42510007. The next prime is 42510019. The reversal of 42510009 is 90001524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42510009 - 2¹ = 42510007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42510001) 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, 7084999 + ... + 7085004.

It is an arithmetic number, because the mean of its divisors is an integer number (14170004).

Almost surely, 2^42510009 is an apocalyptic number.

It is an amenable number.

42510009 is a deficient number, since it is larger than the sum of its proper divisors (14170007).

42510009 is a wasteful number, since it uses less digits than its factorization.

42510009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14170006.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 42510009 is about 6519.9700152685. The cubic root of 42510009 is about 349.0039955427.

The spelling of 42510009 in words is "forty-two million, five hundred ten thousand, nine".