42172541 has 2 divisors, whose sum is σ = 42172542. Its totient is φ = 42172540.

The previous prime is 42172531. The next prime is 42172591. The reversal of 42172541 is 14527124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42120100 + 52441 = 6490^2 + 229^2 .

It is a cyclic number.

It is not a de Polignac number, because 42172541 - 2¹⁴ = 42156157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42172541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42172511) 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, 21086270 + 21086271.

It is an arithmetic number, because the mean of its divisors is an integer number (21086271).

Almost surely, 2^42172541 is an apocalyptic number.

It is an amenable number.

42172541 is a deficient number, since it is larger than the sum of its proper divisors (1).

42172541 is an equidigital number, since it uses as much as digits as its factorization.

42172541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 26.

The square root of 42172541 is about 6494.0388819286. The cubic root of 42172541 is about 348.0780118628.

Adding to 42172541 its reverse (14527124), we get a palindrome (56699665).

The spelling of 42172541 in words is "forty-two million, one hundred seventy-two thousand, five hundred forty-one".