420409901 has 2 divisors, whose sum is σ = 420409902. Its totient is φ = 420409900.

The previous prime is 420409867. The next prime is 420409921. The reversal of 420409901 is 109904024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403608100 + 16801801 = 20090^2 + 4099^2 .

It is a cyclic number.

It is not a de Polignac number, because 420409901 - 2⁶ = 420409837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420409921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210204950 + 210204951.

It is an arithmetic number, because the mean of its divisors is an integer number (210204951).

Almost surely, 2^420409901 is an apocalyptic number.

It is an amenable number.

420409901 is a deficient number, since it is larger than the sum of its proper divisors (1).

420409901 is an equidigital number, since it uses as much as digits as its factorization.

420409901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 420409901 is about 20503.8996534806. The cubic root of 420409901 is about 749.1307861975.

The spelling of 420409901 in words is "four hundred twenty million, four hundred nine thousand, nine hundred one".