42155911 has 4 divisors (see below), whose sum is σ = 48178192. Its totient is φ = 36133632.

The previous prime is 42155891. The next prime is 42155921. The reversal of 42155911 is 11955124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42155911 - 2¹⁷ = 42024839 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 42155911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42155921) 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, 3011130 + ... + 3011143.

It is an arithmetic number, because the mean of its divisors is an integer number (12044548).

Almost surely, 2^42155911 is an apocalyptic number.

42155911 is a deficient number, since it is larger than the sum of its proper divisors (6022281).

42155911 is an equidigital number, since it uses as much as digits as its factorization.

42155911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6022280.

The product of its digits is 1800, while the sum is 28.

The square root of 42155911 is about 6492.7583506550. The cubic root of 42155911 is about 348.0322530330.

The spelling of 42155911 in words is "forty-two million, one hundred fifty-five thousand, nine hundred eleven".