420651481 has 2 divisors, whose sum is σ = 420651482. Its totient is φ = 420651480.

The previous prime is 420651479. The next prime is 420651503. The reversal of 420651481 is 184156024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420619081 + 32400 = 20509^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 420651481 - 2¹ = 420651479 is a prime.

It is a super-2 number, since 2×420651481² = 353895336934986722, which contains 22 as substring.

Together with 420651479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (420652481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210325740 + 210325741.

It is an arithmetic number, because the mean of its divisors is an integer number (210325741).

Almost surely, 2^420651481 is an apocalyptic number.

It is an amenable number.

420651481 is a deficient number, since it is larger than the sum of its proper divisors (1).

420651481 is an equidigital number, since it uses as much as digits as its factorization.

420651481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 420651481 is about 20509.7898819076. The cubic root of 420651481 is about 749.2742496455.

The spelling of 420651481 in words is "four hundred twenty million, six hundred fifty-one thousand, four hundred eighty-one".