42916609 has 6 divisors (see below), whose sum is σ = 43312646. Its totient is φ = 42524160.

The previous prime is 42916579. The next prime is 42916631. The reversal of 42916609 is 90661924.

It can be written as a sum of positive squares in 3 ways, for example, as 705600 + 42211009 = 840^2 + 6497^2 .

It is not a de Polignac number, because 42916609 - 2¹⁷ = 42785537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42916009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11089 + ... + 14449.

Almost surely, 2^42916609 is an apocalyptic number.

It is an amenable number.

42916609 is a deficient number, since it is larger than the sum of its proper divisors (396037).

42916609 is an equidigital number, since it uses as much as digits as its factorization.

42916609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587 (or 3474 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 42916609 is about 6551.0769343674. The cubic root of 42916609 is about 350.1131851622.

The spelling of 42916609 in words is "forty-two million, nine hundred sixteen thousand, six hundred nine".