42155201 has 4 divisors (see below), whose sum is σ = 45987504. Its totient is φ = 38322900.

The previous prime is 42155147. The next prime is 42155203. The reversal of 42155201 is 10255124.

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 42155201 - 2⁶ = 42155137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42155203) 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, 1916135 + ... + 1916156.

It is an arithmetic number, because the mean of its divisors is an integer number (11496876).

Almost surely, 2^42155201 is an apocalyptic number.

It is an amenable number.

42155201 is a deficient number, since it is larger than the sum of its proper divisors (3832303).

42155201 is a wasteful number, since it uses less digits than its factorization.

42155201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3832302.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 42155201 is about 6492.7036741253. The cubic root of 42155201 is about 348.0302991411.

The spelling of 42155201 in words is "forty-two million, one hundred fifty-five thousand, two hundred one".