42598609 has 2 divisors, whose sum is σ = 42598610. Its totient is φ = 42598608.

The previous prime is 42598607. The next prime is 42598613. The reversal of 42598609 is 90689524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42510400 + 88209 = 6520^2 + 297^2 .

It is a cyclic number.

It is not a de Polignac number, because 42598609 - 2¹ = 42598607 is a prime.

Together with 42598607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42598601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21299304 + 21299305.

It is an arithmetic number, because the mean of its divisors is an integer number (21299305).

Almost surely, 2^42598609 is an apocalyptic number.

It is an amenable number.

42598609 is a deficient number, since it is larger than the sum of its proper divisors (1).

42598609 is an equidigital number, since it uses as much as digits as its factorization.

42598609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 42598609 is about 6526.7609884230. The cubic root of 42598609 is about 349.2462937453.

The spelling of 42598609 in words is "forty-two million, five hundred ninety-eight thousand, six hundred nine".