42173129 has 2 divisors, whose sum is σ = 42173130. Its totient is φ = 42173128.

The previous prime is 42173111. The next prime is 42173137. The reversal of 42173129 is 92137124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21715600 + 20457529 = 4660^2 + 4523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42173129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42173189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21086564 + 21086565.

It is an arithmetic number, because the mean of its divisors is an integer number (21086565).

Almost surely, 2^42173129 is an apocalyptic number.

It is an amenable number.

42173129 is a deficient number, since it is larger than the sum of its proper divisors (1).

42173129 is an equidigital number, since it uses as much as digits as its factorization.

42173129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 42173129 is about 6494.0841540590. The cubic root of 42173129 is about 348.0796295736.

The spelling of 42173129 in words is "forty-two million, one hundred seventy-three thousand, one hundred twenty-nine".