542191 has 8 divisors (see below), whose sum is σ = 589680. Its totient is φ = 495552.

The previous prime is 542189. The next prime is 542197. The reversal of 542191 is 191245.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 542191 - 2¹ = 542189 is a prime.

542191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542197) 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 7 ways as a sum of consecutive naturals, for example, 2211 + ... + 2443.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2⁵⁴²¹⁹¹ is an apocalyptic number.

542191 is the 466-th heptagonal number.

542191 is a deficient number, since it is larger than the sum of its proper divisors (47489).

542191 is a wasteful number, since it uses less digits than its factorization.

542191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425.

The product of its digits is 360, while the sum is 22.

The square root of 542191 is about 736.3362003868. The cubic root of 542191 is about 81.5425148600.

The spelling of 542191 in words is "five hundred forty-two thousand, one hundred ninety-one".