42322909 has 2 divisors, whose sum is σ = 42322910. Its totient is φ = 42322908.

The previous prime is 42322873. The next prime is 42322913. The reversal of 42322909 is 90922324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22297284 + 20025625 = 4722^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 42322909 - 2²⁵ = 8768477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42322949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21161454 + 21161455.

It is an arithmetic number, because the mean of its divisors is an integer number (21161455).

Almost surely, 2^42322909 is an apocalyptic number.

It is an amenable number.

42322909 is a deficient number, since it is larger than the sum of its proper divisors (1).

42322909 is an equidigital number, since it uses as much as digits as its factorization.

42322909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 42322909 is about 6505.6059671640. The cubic root of 42322909 is about 348.4912168345.

It can be divided in two parts, 423 and 22909, that added together give a palindrome (23332).

The spelling of 42322909 in words is "forty-two million, three hundred twenty-two thousand, nine hundred nine".