42552409 has 2 divisors, whose sum is σ = 42552410. Its totient is φ = 42552408.

The previous prime is 42552407. The next prime is 42552427. The reversal of 42552409 is 90425524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40513225 + 2039184 = 6365^2 + 1428^2 .

It is a cyclic number.

It is not a de Polignac number, because 42552409 - 2¹ = 42552407 is a prime.

Together with 42552407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42552407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21276204 + 21276205.

It is an arithmetic number, because the mean of its divisors is an integer number (21276205).

Almost surely, 2^42552409 is an apocalyptic number.

It is an amenable number.

42552409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42552409 is an equidigital number, since it uses as much as digits as its factorization.

42552409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 42552409 is about 6523.2207535848. The cubic root of 42552409 is about 349.1199905962.

The spelling of 42552409 in words is "forty-two million, five hundred fifty-two thousand, four hundred nine".