542539021 has 2 divisors, whose sum is σ = 542539022. Its totient is φ = 542539020.

The previous prime is 542539013. The next prime is 542539031. The reversal of 542539021 is 120935245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 542424100 + 114921 = 23290^2 + 339^2 .

It is a cyclic number.

It is not a de Polignac number, because 542539021 - 2³ = 542539013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542539031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271269510 + 271269511.

It is an arithmetic number, because the mean of its divisors is an integer number (271269511).

Almost surely, 2^542539021 is an apocalyptic number.

It is an amenable number.

542539021 is a deficient number, since it is larger than the sum of its proper divisors (1).

542539021 is an equidigital number, since it uses as much as digits as its factorization.

542539021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 542539021 is about 23292.4670440896. The cubic root of 542539021 is about 815.5995793685.

The spelling of 542539021 in words is "five hundred forty-two million, five hundred thirty-nine thousand, twenty-one".