542505221 has 2 divisors, whose sum is σ = 542505222. Its totient is φ = 542505220.

The previous prime is 542505193. The next prime is 542505247. The reversal of 542505221 is 122505245.

It is an a-pointer prime, because the next prime (542505247) can be obtained adding 542505221 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450076225 + 92428996 = 21215^2 + 9614^2 .

It is a cyclic number.

It is not a de Polignac number, because 542505221 - 2²² = 538310917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542505421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271252610 + 271252611.

It is an arithmetic number, because the mean of its divisors is an integer number (271252611).

Almost surely, 2^542505221 is an apocalyptic number.

It is an amenable number.

542505221 is a deficient number, since it is larger than the sum of its proper divisors (1).

542505221 is an equidigital number, since it uses as much as digits as its factorization.

542505221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 542505221 is about 23291.7414763259. The cubic root of 542505221 is about 815.5826418229.

The spelling of 542505221 in words is "five hundred forty-two million, five hundred five thousand, two hundred twenty-one".