42055191 has 24 divisors (see below), whose sum is σ = 63180000. Its totient is φ = 26924352.

The previous prime is 42055183. The next prime is 42055193. The reversal of 42055191 is 19155024.

42055191 is a `hidden beast` number, since 4 + 20 + 551 + 91 = 666.

It is not a de Polignac number, because 42055191 - 2³ = 42055183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42055193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69910 + ... + 70508.

It is an arithmetic number, because the mean of its divisors is an integer number (2632500).

Almost surely, 2^42055191 is an apocalyptic number.

42055191 is a deficient number, since it is larger than the sum of its proper divisors (21124809).

42055191 is a wasteful number, since it uses less digits than its factorization.

42055191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903 (or 900 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 42055191 is about 6484.9973785654. The cubic root of 42055191 is about 347.7548560879.

It can be divided in two parts, 420 and 55191, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 42055191 in words is "forty-two million, fifty-five thousand, one hundred ninety-one".