42517789 has 2 divisors, whose sum is σ = 42517790. Its totient is φ = 42517788.

The previous prime is 42517759. The next prime is 42517807. The reversal of 42517789 is 98771524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41344900 + 1172889 = 6430^2 + 1083^2 .

It is a cyclic number.

It is not a de Polignac number, because 42517789 - 2⁷ = 42517661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42517729) 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, 21258894 + 21258895.

It is an arithmetic number, because the mean of its divisors is an integer number (21258895).

Almost surely, 2^42517789 is an apocalyptic number.

It is an amenable number.

42517789 is a deficient number, since it is larger than the sum of its proper divisors (1).

42517789 is an equidigital number, since it uses as much as digits as its factorization.

42517789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 42517789 is about 6520.5666164836. The cubic root of 42517789 is about 349.0252853167.

The spelling of 42517789 in words is "forty-two million, five hundred seventeen thousand, seven hundred eighty-nine".