420241646509 has 2 divisors, whose sum is σ = 420241646510. Its totient is φ = 420241646508.

The previous prime is 420241646497. The next prime is 420241646567. The reversal of 420241646509 is 905646142024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389871613609 + 30370032900 = 624397^2 + 174270^2 .

It is a cyclic number.

It is not a de Polignac number, because 420241646509 - 2¹⁷ = 420241515437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420241646579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210120823254 + 210120823255.

It is an arithmetic number, because the mean of its divisors is an integer number (210120823255).

Almost surely, 2^420241646509 is an apocalyptic number.

It is an amenable number.

420241646509 is a deficient number, since it is larger than the sum of its proper divisors (1).

420241646509 is an equidigital number, since it uses as much as digits as its factorization.

420241646509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 420241646509 in words is "four hundred twenty billion, two hundred forty-one million, six hundred forty-six thousand, five hundred nine".