538278409 has 2 divisors, whose sum is σ = 538278410. Its totient is φ = 538278408.

The previous prime is 538278383. The next prime is 538278427. The reversal of 538278409 is 904872835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509495184 + 28783225 = 22572^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 538278409 - 2⁷ = 538278281 is a prime.

It is not a weakly prime, because it can be changed into another prime (538278509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269139204 + 269139205.

It is an arithmetic number, because the mean of its divisors is an integer number (269139205).

Almost surely, 2^538278409 is an apocalyptic number.

It is an amenable number.

538278409 is a deficient number, since it is larger than the sum of its proper divisors (1).

538278409 is an equidigital number, since it uses as much as digits as its factorization.

538278409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 538278409 is about 23200.8277654053. The cubic root of 538278409 is about 813.4589716592.

The spelling of 538278409 in words is "five hundred thirty-eight million, two hundred seventy-eight thousand, four hundred nine".