542221999 has 4 divisors (see below), whose sum is σ = 591514920. Its totient is φ = 492929080.

The previous prime is 542221957. The next prime is 542222011. The reversal of 542221999 is 999122245.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 542221999 - 2⁷ = 542221871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542221399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24646444 + ... + 24646465.

It is an arithmetic number, because the mean of its divisors is an integer number (147878730).

Almost surely, 2^542221999 is an apocalyptic number.

542221999 is a deficient number, since it is larger than the sum of its proper divisors (49292921).

542221999 is a wasteful number, since it uses less digits than its factorization.

542221999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49292920.

The product of its digits is 116640, while the sum is 43.

The square root of 542221999 is about 23285.6608023049. The cubic root of 542221999 is about 815.4406885617.

The spelling of 542221999 in words is "five hundred forty-two million, two hundred twenty-one thousand, nine hundred ninety-nine".