420292781 has 2 divisors, whose sum is σ = 420292782. Its totient is φ = 420292780.

The previous prime is 420292759. The next prime is 420292811. The reversal of 420292781 is 187292024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322777156 + 97515625 = 17966^2 + 9875^2 .

It is a cyclic number.

It is not a de Polignac number, because 420292781 - 2²⁶ = 353183917 is a prime.

It is a super-2 number, since 2×420292781² = 353292043521427922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420292721) 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, 210146390 + 210146391.

It is an arithmetic number, because the mean of its divisors is an integer number (210146391).

Almost surely, 2^420292781 is an apocalyptic number.

It is an amenable number.

420292781 is a deficient number, since it is larger than the sum of its proper divisors (1).

420292781 is an equidigital number, since it uses as much as digits as its factorization.

420292781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 420292781 is about 20501.0434124705. The cubic root of 420292781 is about 749.0612141392.

The spelling of 420292781 in words is "four hundred twenty million, two hundred ninety-two thousand, seven hundred eighty-one".