42123259 has 2 divisors, whose sum is σ = 42123260. Its totient is φ = 42123258.

The previous prime is 42123239. The next prime is 42123269. The reversal of 42123259 is 95232124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42123259 - 2¹⁷ = 41992187 is a prime.

It is a Chen prime.

It is equal to p_2554615 and since 42123259 and 2554615 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42123239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061629 + 21061630.

It is an arithmetic number, because the mean of its divisors is an integer number (21061630).

Almost surely, 2^42123259 is an apocalyptic number.

42123259 is a deficient number, since it is larger than the sum of its proper divisors (1).

42123259 is an equidigital number, since it uses as much as digits as its factorization.

42123259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 42123259 is about 6490.2433698591. The cubic root of 42123259 is about 347.9423733134.

The spelling of 42123259 in words is "forty-two million, one hundred twenty-three thousand, two hundred fifty-nine".