420777569 has 2 divisors, whose sum is σ = 420777570. Its totient is φ = 420777568.

The previous prime is 420777563. The next prime is 420777613. The reversal of 420777569 is 965777024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298011169 + 122766400 = 17263^2 + 11080^2 .

It is a cyclic number.

It is not a de Polignac number, because 420777569 - 2¹² = 420773473 is a prime.

It is a super-3 number, since 3×420777569³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420777563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210388784 + 210388785.

It is an arithmetic number, because the mean of its divisors is an integer number (210388785).

Almost surely, 2^420777569 is an apocalyptic number.

It is an amenable number.

420777569 is a deficient number, since it is larger than the sum of its proper divisors (1).

420777569 is an equidigital number, since it uses as much as digits as its factorization.

420777569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 740880, while the sum is 47.

The square root of 420777569 is about 20512.8635007402. The cubic root of 420777569 is about 749.3491057976.

The spelling of 420777569 in words is "four hundred twenty million, seven hundred seventy-seven thousand, five hundred sixty-nine".