420416861 has 2 divisors, whose sum is σ = 420416862. Its totient is φ = 420416860.

The previous prime is 420416837. The next prime is 420416963. The reversal of 420416861 is 168614024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310816900 + 109599961 = 17630^2 + 10469^2 .

It is a cyclic number.

It is not a de Polignac number, because 420416861 - 2⁶ = 420416797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420416561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210208430 + 210208431.

It is an arithmetic number, because the mean of its divisors is an integer number (210208431).

Almost surely, 2^420416861 is an apocalyptic number.

It is an amenable number.

420416861 is a deficient number, since it is larger than the sum of its proper divisors (1).

420416861 is an equidigital number, since it uses as much as digits as its factorization.

420416861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 420416861 is about 20504.0693765896. The cubic root of 420416861 is about 749.1349201958.

The spelling of 420416861 in words is "four hundred twenty million, four hundred sixteen thousand, eight hundred sixty-one".