42189517 has 2 divisors, whose sum is σ = 42189518. Its totient is φ = 42189516.

The previous prime is 42189487. The next prime is 42189559. The reversal of 42189517 is 71598124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41332041 + 857476 = 6429^2 + 926^2 .

It is a cyclic number.

It is not a de Polignac number, because 42189517 - 2¹⁹ = 41665229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42189617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21094758 + 21094759.

It is an arithmetic number, because the mean of its divisors is an integer number (21094759).

Almost surely, 2^42189517 is an apocalyptic number.

It is an amenable number.

42189517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42189517 is an equidigital number, since it uses as much as digits as its factorization.

42189517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 42189517 is about 6495.3457952599. The cubic root of 42189517 is about 348.1247103346.

The spelling of 42189517 in words is "forty-two million, one hundred eighty-nine thousand, five hundred seventeen".