542591 has 4 divisors (see below), whose sum is σ = 620112. Its totient is φ = 465072.

The previous prime is 542587. The next prime is 542599. The reversal of 542591 is 195245.

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 542591 - 2² = 542587 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 542591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542599) 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, 38750 + ... + 38763.

It is an arithmetic number, because the mean of its divisors is an integer number (155028).

2⁵⁴²⁵⁹¹ is an apocalyptic number.

542591 is a deficient number, since it is larger than the sum of its proper divisors (77521).

542591 is an equidigital number, since it uses as much as digits as its factorization.

542591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77520.

The product of its digits is 1800, while the sum is 26.

The square root of 542591 is about 736.6077653677. The cubic root of 542591 is about 81.5625625235.

The spelling of 542591 in words is "five hundred forty-two thousand, five hundred ninety-one".