42534409 has 2 divisors, whose sum is σ = 42534410. Its totient is φ = 42534408.

The previous prime is 42534397. The next prime is 42534413. The reversal of 42534409 is 90443524.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40284409 + 2250000 = 6347^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 42534409 - 2⁵ = 42534377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42534419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21267204 + 21267205.

It is an arithmetic number, because the mean of its divisors is an integer number (21267205).

Almost surely, 2^42534409 is an apocalyptic number.

It is an amenable number.

42534409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42534409 is an equidigital number, since it uses as much as digits as its factorization.

42534409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 42534409 is about 6521.8409210897. The cubic root of 42534409 is about 349.0707568296.

The spelling of 42534409 in words is "forty-two million, five hundred thirty-four thousand, four hundred nine".