42331609 has 2 divisors, whose sum is σ = 42331610. Its totient is φ = 42331608.

The previous prime is 42331607. The next prime is 42331613. The reversal of 42331609 is 90613324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40602384 + 1729225 = 6372^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 42331609 - 2¹ = 42331607 is a prime.

Together with 42331607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42331603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21165804 + 21165805.

It is an arithmetic number, because the mean of its divisors is an integer number (21165805).

Almost surely, 2^42331609 is an apocalyptic number.

It is an amenable number.

42331609 is a deficient number, since it is larger than the sum of its proper divisors (1).

42331609 is an equidigital number, since it uses as much as digits as its factorization.

42331609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 42331609 is about 6506.2745868892. The cubic root of 42331609 is about 348.5150940988.

The spelling of 42331609 in words is "forty-two million, three hundred thirty-one thousand, six hundred nine".