42009571 has 2 divisors, whose sum is σ = 42009572. Its totient is φ = 42009570.

The previous prime is 42009509. The next prime is 42009577. The reversal of 42009571 is 17590024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42009571 - 2⁹ = 42009059 is a prime.

It is not a weakly prime, because it can be changed into another prime (42009577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21004785 + 21004786.

It is an arithmetic number, because the mean of its divisors is an integer number (21004786).

Almost surely, 2^42009571 is an apocalyptic number.

42009571 is a deficient number, since it is larger than the sum of its proper divisors (1).

42009571 is an equidigital number, since it uses as much as digits as its factorization.

42009571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 42009571 is about 6481.4790750260. The cubic root of 42009571 is about 347.6290664920.

Adding to 42009571 its reverse (17590024), we get a palindrome (59599595).

The spelling of 42009571 in words is "forty-two million, nine thousand, five hundred seventy-one".