42129149 has 2 divisors, whose sum is σ = 42129150. Its totient is φ = 42129148.

The previous prime is 42129119. The next prime is 42129167. The reversal of 42129149 is 94192124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27825625 + 14303524 = 5275^2 + 3782^2 .

It is a cyclic number.

It is not a de Polignac number, because 42129149 - 2²⁰ = 41080573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42129119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21064574 + 21064575.

It is an arithmetic number, because the mean of its divisors is an integer number (21064575).

Almost surely, 2^42129149 is an apocalyptic number.

It is an amenable number.

42129149 is a deficient number, since it is larger than the sum of its proper divisors (1).

42129149 is an equidigital number, since it uses as much as digits as its factorization.

42129149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 42129149 is about 6490.6971120212. The cubic root of 42129149 is about 347.9585898892.

The spelling of 42129149 in words is "forty-two million, one hundred twenty-nine thousand, one hundred forty-nine".