542097421 has 2 divisors, whose sum is σ = 542097422. Its totient is φ = 542097420.

The previous prime is 542097349. The next prime is 542097427. The reversal of 542097421 is 124790245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514155625 + 27941796 = 22675^2 + 5286^2 .

It is a cyclic number.

It is not a de Polignac number, because 542097421 - 2¹¹ = 542095373 is a prime.

It is a super-2 number, since 2×542097421² = 587739227709702482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542097427) 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, 271048710 + 271048711.

It is an arithmetic number, because the mean of its divisors is an integer number (271048711).

Almost surely, 2^542097421 is an apocalyptic number.

It is an amenable number.

542097421 is a deficient number, since it is larger than the sum of its proper divisors (1).

542097421 is an equidigital number, since it uses as much as digits as its factorization.

542097421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 542097421 is about 23282.9856547652. The cubic root of 542097421 is about 815.3782333612.

The spelling of 542097421 in words is "five hundred forty-two million, ninety-seven thousand, four hundred twenty-one".