542279921 has 2 divisors, whose sum is σ = 542279922. Its totient is φ = 542279920.

The previous prime is 542279873. The next prime is 542279971. The reversal of 542279921 is 129972245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404452321 + 137827600 = 20111^2 + 11740^2 .

It is a cyclic number.

It is not a de Polignac number, because 542279921 - 2¹⁴ = 542263537 is a prime.

It is not a weakly prime, because it can be changed into another prime (542279971) 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 as a sum of consecutive naturals, namely, 271139960 + 271139961.

It is an arithmetic number, because the mean of its divisors is an integer number (271139961).

Almost surely, 2^542279921 is an apocalyptic number.

It is an amenable number.

542279921 is a deficient number, since it is larger than the sum of its proper divisors (1).

542279921 is an equidigital number, since it uses as much as digits as its factorization.

542279921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 542279921 is about 23286.9044958749. The cubic root of 542279921 is about 815.4697235781.

The spelling of 542279921 in words is "five hundred forty-two million, two hundred seventy-nine thousand, nine hundred twenty-one".