42048509 has 2 divisors, whose sum is σ = 42048510. Its totient is φ = 42048508.

The previous prime is 42048499. The next prime is 42048527. The reversal of 42048509 is 90584024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36264484 + 5784025 = 6022^2 + 2405^2 .

It is a cyclic number.

It is not a de Polignac number, because 42048509 - 2¹² = 42044413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42048569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21024254 + 21024255.

It is an arithmetic number, because the mean of its divisors is an integer number (21024255).

Almost surely, 2^42048509 is an apocalyptic number.

It is an amenable number.

42048509 is a deficient number, since it is larger than the sum of its proper divisors (1).

42048509 is an equidigital number, since it uses as much as digits as its factorization.

42048509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 42048509 is about 6484.4821689939. The cubic root of 42048509 is about 347.7364372675.

The spelling of 42048509 in words is "forty-two million, forty-eight thousand, five hundred nine".