42511909 has 4 divisors (see below), whose sum is σ = 46376640. Its totient is φ = 38647180.

The previous prime is 42511901. The next prime is 42511913. The reversal of 42511909 is 90911524.

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 42511909 - 2³ = 42511901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42511901) by changing a digit.

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, 1932349 + ... + 1932370.

It is an arithmetic number, because the mean of its divisors is an integer number (11594160).

Almost surely, 2^42511909 is an apocalyptic number.

It is an amenable number.

42511909 is a deficient number, since it is larger than the sum of its proper divisors (3864731).

42511909 is a wasteful number, since it uses less digits than its factorization.

42511909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864730.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 42511909 is about 6520.1157198320. The cubic root of 42511909 is about 349.0091950845.

The spelling of 42511909 in words is "forty-two million, five hundred eleven thousand, nine hundred nine".