542121997 has 2 divisors, whose sum is σ = 542121998. Its totient is φ = 542121996.

The previous prime is 542121989. The next prime is 542122013. The reversal of 542121997 is 799121245.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524364201 + 17757796 = 22899^2 + 4214^2 .

It is a cyclic number.

It is not a de Polignac number, because 542121997 - 2³ = 542121989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542151997) 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, 271060998 + 271060999.

It is an arithmetic number, because the mean of its divisors is an integer number (271060999).

Almost surely, 2^542121997 is an apocalyptic number.

It is an amenable number.

542121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

542121997 is an equidigital number, since it uses as much as digits as its factorization.

542121997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 542121997 is about 23283.5134161492. The cubic root of 542121997 is about 815.3905549058.

The spelling of 542121997 in words is "five hundred forty-two million, one hundred twenty-one thousand, nine hundred ninety-seven".