420765571 has 2 divisors, whose sum is σ = 420765572. Its totient is φ = 420765570.

The previous prime is 420765563. The next prime is 420765593. The reversal of 420765571 is 175567024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420765571 - 2³ = 420765563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420765571.

It is not a weakly prime, because it can be changed into another prime (420765071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210382785 + 210382786.

It is an arithmetic number, because the mean of its divisors is an integer number (210382786).

Almost surely, 2^420765571 is an apocalyptic number.

420765571 is a deficient number, since it is larger than the sum of its proper divisors (1).

420765571 is an equidigital number, since it uses as much as digits as its factorization.

420765571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 420765571 is about 20512.5710480183. The cubic root of 420765571 is about 749.3419834471.

The spelling of 420765571 in words is "four hundred twenty million, seven hundred sixty-five thousand, five hundred seventy-one".