42129641 has 2 divisors, whose sum is σ = 42129642. Its totient is φ = 42129640.

The previous prime is 42129559. The next prime is 42129653. The reversal of 42129641 is 14692124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 3254416 = 6235^2 + 1804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42129641 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42129671) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21064820 + 21064821.

It is an arithmetic number, because the mean of its divisors is an integer number (21064821).

Almost surely, 2^42129641 is an apocalyptic number.

It is an amenable number.

42129641 is a deficient number, since it is larger than the sum of its proper divisors (1).

42129641 is an equidigital number, since it uses as much as digits as its factorization.

42129641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 42129641 is about 6490.7350123079. The cubic root of 42129641 is about 347.9599444142.

The spelling of 42129641 in words is "forty-two million, one hundred twenty-nine thousand, six hundred forty-one".