42171061 has 2 divisors, whose sum is σ = 42171062. Its totient is φ = 42171060.

The previous prime is 42171053. The next prime is 42171091. The reversal of 42171061 is 16017124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41036836 + 1134225 = 6406^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 42171061 - 2³ = 42171053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42171011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21085530 + 21085531.

It is an arithmetic number, because the mean of its divisors is an integer number (21085531).

Almost surely, 2^42171061 is an apocalyptic number.

It is an amenable number.

42171061 is a deficient number, since it is larger than the sum of its proper divisors (1).

42171061 is an equidigital number, since it uses as much as digits as its factorization.

42171061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 42171061 is about 6493.9249302714. The cubic root of 42171061 is about 348.0739400073.

Adding to 42171061 its reverse (16017124), we get a palindrome (58188185).

The spelling of 42171061 in words is "forty-two million, one hundred seventy-one thousand, sixty-one".