542669681 has 2 divisors, whose sum is σ = 542669682. Its totient is φ = 542669680.

The previous prime is 542669671. The next prime is 542669683. The reversal of 542669681 is 186966245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478909456 + 63760225 = 21884^2 + 7985^2 .

It is a cyclic number.

It is not a de Polignac number, because 542669681 - 2¹⁴ = 542653297 is a prime.

It is a super-3 number, since 3×542669681³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 542669683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (542669683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271334840 + 271334841.

It is an arithmetic number, because the mean of its divisors is an integer number (271334841).

Almost surely, 2^542669681 is an apocalyptic number.

It is an amenable number.

542669681 is a deficient number, since it is larger than the sum of its proper divisors (1).

542669681 is an equidigital number, since it uses as much as digits as its factorization.

542669681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The square root of 542669681 is about 23295.2716446922. The cubic root of 542669681 is about 815.6650478929.

The spelling of 542669681 in words is "five hundred forty-two million, six hundred sixty-nine thousand, six hundred eighty-one".