42599009 has 2 divisors, whose sum is σ = 42599010. Its totient is φ = 42599008.

The previous prime is 42598949. The next prime is 42599017. The reversal of 42599009 is 90099524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39187600 + 3411409 = 6260^2 + 1847^2 .

It is a cyclic number.

It is not a de Polignac number, because 42599009 - 2¹² = 42594913 is a prime.

It is not a weakly prime, because it can be changed into another prime (42599309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21299504 + 21299505.

It is an arithmetic number, because the mean of its divisors is an integer number (21299505).

Almost surely, 2^42599009 is an apocalyptic number.

It is an amenable number.

42599009 is a deficient number, since it is larger than the sum of its proper divisors (1).

42599009 is an equidigital number, since it uses as much as digits as its factorization.

42599009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 42599009 is about 6526.7916314220. The cubic root of 42599009 is about 349.2473868802.

The spelling of 42599009 in words is "forty-two million, five hundred ninety-nine thousand, nine".