42555571 has 2 divisors, whose sum is σ = 42555572. Its totient is φ = 42555570.

The previous prime is 42555523. The next prime is 42555577. The reversal of 42555571 is 17555524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42555571 - 2¹⁵ = 42522803 is a prime.

It is not a weakly prime, because it can be changed into another prime (42555577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21277785 + 21277786.

It is an arithmetic number, because the mean of its divisors is an integer number (21277786).

Almost surely, 2^42555571 is an apocalyptic number.

42555571 is a deficient number, since it is larger than the sum of its proper divisors (1).

42555571 is an equidigital number, since it uses as much as digits as its factorization.

42555571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35000, while the sum is 34.

The square root of 42555571 is about 6523.4631140216. The cubic root of 42555571 is about 349.1286378941.

The spelling of 42555571 in words is "forty-two million, five hundred fifty-five thousand, five hundred seventy-one".