42155549 has 4 divisors (see below), whose sum is σ = 42414336. Its totient is φ = 41896764.

The previous prime is 42155513. The next prime is 42155551. The reversal of 42155549 is 94555124.

It is a happy number.

42155549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 42155549 - 2⁸ = 42155293 is a prime.

It is a super-2 number, since 2×42155549² = 3554180622982802, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42155579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129149 + ... + 129474.

It is an arithmetic number, because the mean of its divisors is an integer number (10603584).

Almost surely, 2^42155549 is an apocalyptic number.

It is an amenable number.

42155549 is a deficient number, since it is larger than the sum of its proper divisors (258787).

42155549 is a wasteful number, since it uses less digits than its factorization.

42155549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258786.

The product of its digits is 36000, while the sum is 35.

The square root of 42155549 is about 6492.7304733833. The cubic root of 42155549 is about 348.0312568261.

The spelling of 42155549 in words is "forty-two million, one hundred fifty-five thousand, five hundred forty-nine".