420765491 has 2 divisors, whose sum is σ = 420765492. Its totient is φ = 420765490.

The previous prime is 420765481. The next prime is 420765539. The reversal of 420765491 is 194567024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420765491 - 2¹⁴ = 420749107 is a prime.

It is not a weakly prime, because it can be changed into another prime (420765481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210382745 + 210382746.

It is an arithmetic number, because the mean of its divisors is an integer number (210382746).

Almost surely, 2^420765491 is an apocalyptic number.

420765491 is a deficient number, since it is larger than the sum of its proper divisors (1).

420765491 is an equidigital number, since it uses as much as digits as its factorization.

420765491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 420765491 is about 20512.5690979945. The cubic root of 420765491 is about 749.3419359563.

The spelling of 420765491 in words is "four hundred twenty million, seven hundred sixty-five thousand, four hundred ninety-one".