542778539 has 2 divisors, whose sum is σ = 542778540. Its totient is φ = 542778538.

The previous prime is 542778521. The next prime is 542778553. The reversal of 542778539 is 935877245.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542778539 is a prime.

It is not a weakly prime, because it can be changed into another prime (542778139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271389269 + 271389270.

It is an arithmetic number, because the mean of its divisors is an integer number (271389270).

Almost surely, 2^542778539 is an apocalyptic number.

542778539 is a deficient number, since it is larger than the sum of its proper divisors (1).

542778539 is an equidigital number, since it uses as much as digits as its factorization.

542778539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 50.

The square root of 542778539 is about 23297.6080102658. The cubic root of 542778539 is about 815.7195842787.

The spelling of 542778539 in words is "five hundred forty-two million, seven hundred seventy-eight thousand, five hundred thirty-nine".