538744681 has 2 divisors, whose sum is σ = 538744682. Its totient is φ = 538744680.

The previous prime is 538744649. The next prime is 538744699. The reversal of 538744681 is 186447835.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431808400 + 106936281 = 20780^2 + 10341^2 .

It is a cyclic number.

It is not a de Polignac number, because 538744681 - 2⁵ = 538744649 is a prime.

It is a super-2 number, since 2×538744681² = 580491662611583522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (538748681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269372340 + 269372341.

It is an arithmetic number, because the mean of its divisors is an integer number (269372341).

Almost surely, 2^538744681 is an apocalyptic number.

It is an amenable number.

538744681 is a deficient number, since it is larger than the sum of its proper divisors (1).

538744681 is an equidigital number, since it uses as much as digits as its factorization.

538744681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 46.

The square root of 538744681 is about 23210.8741972378. The cubic root of 538744681 is about 813.6937842703.

The spelling of 538744681 in words is "five hundred thirty-eight million, seven hundred forty-four thousand, six hundred eighty-one".