42553409 has 2 divisors, whose sum is σ = 42553410. Its totient is φ = 42553408.

The previous prime is 42553403. The next prime is 42553451. The reversal of 42553409 is 90435524.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26553409 + 16000000 = 5153^2 + 4000^2 .

It is a cyclic number.

It is not a de Polignac number, because 42553409 - 2⁴ = 42553393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42553403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21276704 + 21276705.

It is an arithmetic number, because the mean of its divisors is an integer number (21276705).

Almost surely, 2^42553409 is an apocalyptic number.

It is an amenable number.

42553409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42553409 is an equidigital number, since it uses as much as digits as its factorization.

42553409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 42553409 is about 6523.2974023878. The cubic root of 42553409 is about 349.1227253984.

The spelling of 42553409 in words is "forty-two million, five hundred fifty-three thousand, four hundred nine".