42350509 has 2 divisors, whose sum is σ = 42350510. Its totient is φ = 42350508.

The previous prime is 42350507. The next prime is 42350537. The reversal of 42350509 is 90505324.

It is an a-pointer prime, because the next prime (42350537) can be obtained adding 42350509 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34633225 + 7717284 = 5885^2 + 2778^2 .

It is a cyclic number.

It is not a de Polignac number, because 42350509 - 2¹ = 42350507 is a prime.

It is a super-2 number, since 2×42350509² = 3587131225118162, which contains 22 as substring.

Together with 42350507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42350507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21175254 + 21175255.

It is an arithmetic number, because the mean of its divisors is an integer number (21175255).

Almost surely, 2^42350509 is an apocalyptic number.

It is an amenable number.

42350509 is a deficient number, since it is larger than the sum of its proper divisors (1).

42350509 is an equidigital number, since it uses as much as digits as its factorization.

42350509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 42350509 is about 6507.7268688844. The cubic root of 42350509 is about 348.5669541263.

The spelling of 42350509 in words is "forty-two million, three hundred fifty thousand, five hundred nine".