542921 has 2 divisors, whose sum is σ = 542922. Its totient is φ = 542920.

The previous prime is 542911. The next prime is 542923. The reversal of 542921 is 129245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 1225 = 736^2 + 35^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542921 is a prime.

Together with 542923, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (542923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271460 + 271461.

It is an arithmetic number, because the mean of its divisors is an integer number (271461).

2⁵⁴²⁹²¹ is an apocalyptic number.

It is an amenable number.

542921 is a deficient number, since it is larger than the sum of its proper divisors (1).

542921 is an equidigital number, since it uses as much as digits as its factorization.

542921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 542921 is about 736.8317311300. The cubic root of 542921 is about 81.5790944299.

The spelling of 542921 in words is "five hundred forty-two thousand, nine hundred twenty-one".