42930509 has 2 divisors, whose sum is σ = 42930510. Its totient is φ = 42930508.

The previous prime is 42930479. The next prime is 42930521. The reversal of 42930509 is 90503924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40998409 + 1932100 = 6403^2 + 1390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42930509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42930539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21465254 + 21465255.

It is an arithmetic number, because the mean of its divisors is an integer number (21465255).

Almost surely, 2^42930509 is an apocalyptic number.

It is an amenable number.

42930509 is a deficient number, since it is larger than the sum of its proper divisors (1).

42930509 is an equidigital number, since it uses as much as digits as its factorization.

42930509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 42930509 is about 6552.1377427524. The cubic root of 42930509 is about 350.1509797603.

The spelling of 42930509 in words is "forty-two million, nine hundred thirty thousand, five hundred nine".