42131669 has 2 divisors, whose sum is σ = 42131670. Its totient is φ = 42131668.

The previous prime is 42131657. The next prime is 42131671. The reversal of 42131669 is 96613124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41344900 + 786769 = 6430^2 + 887^2 .

It is a cyclic number.

It is not a de Polignac number, because 42131669 - 2⁸ = 42131413 is a prime.

It is a super-2 number, since 2×42131669² = 3550155065451122, which contains 22 as substring.

Together with 42131671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42133669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21065834 + 21065835.

It is an arithmetic number, because the mean of its divisors is an integer number (21065835).

Almost surely, 2^42131669 is an apocalyptic number.

It is an amenable number.

42131669 is a deficient number, since it is larger than the sum of its proper divisors (1).

42131669 is an equidigital number, since it uses as much as digits as its factorization.

42131669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 42131669 is about 6490.8912331051. The cubic root of 42131669 is about 347.9655275890.

The spelling of 42131669 in words is "forty-two million, one hundred thirty-one thousand, six hundred sixty-nine".