420563501 has 2 divisors, whose sum is σ = 420563502. Its totient is φ = 420563500.

The previous prime is 420563467. The next prime is 420563503. The reversal of 420563501 is 105365024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402965476 + 17598025 = 20074^2 + 4195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420563501 is a prime.

Together with 420563503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420563503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210281750 + 210281751.

It is an arithmetic number, because the mean of its divisors is an integer number (210281751).

Almost surely, 2^420563501 is an apocalyptic number.

It is an amenable number.

420563501 is a deficient number, since it is larger than the sum of its proper divisors (1).

420563501 is an equidigital number, since it uses as much as digits as its factorization.

420563501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 420563501 is about 20507.6449403631. The cubic root of 420563501 is about 749.2220086591. Note that the first 3 decimals are identical.

The spelling of 420563501 in words is "four hundred twenty million, five hundred sixty-three thousand, five hundred one".