420531901 has 2 divisors, whose sum is σ = 420531902. Its totient is φ = 420531900.

The previous prime is 420531869. The next prime is 420531911. The reversal of 420531901 is 109135024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215326276 + 205205625 = 14674^2 + 14325^2 .

It is a cyclic number.

It is not a de Polignac number, because 420531901 - 2⁵ = 420531869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420531911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210265950 + 210265951.

It is an arithmetic number, because the mean of its divisors is an integer number (210265951).

Almost surely, 2^420531901 is an apocalyptic number.

It is an amenable number.

420531901 is a deficient number, since it is larger than the sum of its proper divisors (1).

420531901 is an equidigital number, since it uses as much as digits as its factorization.

420531901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 420531901 is about 20506.8744815001. The cubic root of 420531901 is about 749.2032433530.

Adding to 420531901 its reverse (109135024), we get a palindrome (529666925).

The spelling of 420531901 in words is "four hundred twenty million, five hundred thirty-one thousand, nine hundred one".