542219561 has 4 divisors (see below), whose sum is σ = 583928772. Its totient is φ = 500510352.

The previous prime is 542219533. The next prime is 542219569. The reversal of 542219561 is 165912245.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 111408025 + 430811536 = 10555^2 + 20756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542219561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542219569) 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, 20854586 + ... + 20854611.

It is an arithmetic number, because the mean of its divisors is an integer number (145982193).

Almost surely, 2^542219561 is an apocalyptic number.

It is an amenable number.

542219561 is a deficient number, since it is larger than the sum of its proper divisors (41709211).

542219561 is a wasteful number, since it uses less digits than its factorization.

542219561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41709210.

The product of its digits is 21600, while the sum is 35.

The square root of 542219561 is about 23285.6084524326. The cubic root of 542219561 is about 815.4394664010.

The spelling of 542219561 in words is "five hundred forty-two million, two hundred nineteen thousand, five hundred sixty-one".