420160561 has 2 divisors, whose sum is σ = 420160562. Its totient is φ = 420160560.

The previous prime is 420160553. The next prime is 420160591. The reversal of 420160561 is 165061024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296528400 + 123632161 = 17220^2 + 11119^2 .

It is a cyclic number.

It is not a de Polignac number, because 420160561 - 2³ = 420160553 is a prime.

It is not a weakly prime, because it can be changed into another prime (420160501) 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, 210080280 + 210080281.

It is an arithmetic number, because the mean of its divisors is an integer number (210080281).

Almost surely, 2^420160561 is an apocalyptic number.

It is an amenable number.

420160561 is a deficient number, since it is larger than the sum of its proper divisors (1).

420160561 is an equidigital number, since it uses as much as digits as its factorization.

420160561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 420160561 is about 20497.8184448980. The cubic root of 420160561 is about 748.9826567892.

The spelling of 420160561 in words is "four hundred twenty million, one hundred sixty thousand, five hundred sixty-one".