420561061 has 2 divisors, whose sum is σ = 420561062. Its totient is φ = 420561060.

The previous prime is 420561017. The next prime is 420561073. The reversal of 420561061 is 160165024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420496036 + 65025 = 20506^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 420561061 - 2⁹ = 420560549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420561761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210280530 + 210280531.

It is an arithmetic number, because the mean of its divisors is an integer number (210280531).

Almost surely, 2^420561061 is an apocalyptic number.

It is an amenable number.

420561061 is a deficient number, since it is larger than the sum of its proper divisors (1).

420561061 is an equidigital number, since it uses as much as digits as its factorization.

420561061 is an evil number, because the sum of its binary digits is even.

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

The square root of 420561061 is about 20507.5854502669. The cubic root of 420561061 is about 749.2205597259.

The spelling of 420561061 in words is "four hundred twenty million, five hundred sixty-one thousand, sixty-one".