542651 has 4 divisors (see below), whose sum is σ = 549600. Its totient is φ = 535704.

The previous prime is 542603. The next prime is 542683. The reversal of 542651 is 156245.

Added to its reverse (156245) it gives a square (698896 = 836²).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156245 = 5 ⋅31249.

It is a cyclic number.

It is not a de Polignac number, because 542651 - 2⁶ = 542587 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (542251) 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, 3356 + ... + 3513.

It is an arithmetic number, because the mean of its divisors is an integer number (137400).

2⁵⁴²⁶⁵¹ is an apocalyptic number.

542651 is a deficient number, since it is larger than the sum of its proper divisors (6949).

542651 is an equidigital number, since it uses as much as digits as its factorization.

542651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948.

The product of its digits is 1200, while the sum is 23.

The square root of 542651 is about 736.6484914802. The cubic root of 542651 is about 81.5655688231.

Adding to 542651 its reverse (156245), we get a palindrome (698896).

The spelling of 542651 in words is "five hundred forty-two thousand, six hundred fifty-one".