420328261 has 2 divisors, whose sum is σ = 420328262. Its totient is φ = 420328260.

The previous prime is 420328253. The next prime is 420328267. The reversal of 420328261 is 162823024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311522500 + 108805761 = 17650^2 + 10431^2 .

It is a cyclic number.

It is not a de Polignac number, because 420328261 - 2³ = 420328253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420328267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210164130 + 210164131.

It is an arithmetic number, because the mean of its divisors is an integer number (210164131).

Almost surely, 2^420328261 is an apocalyptic number.

It is an amenable number.

420328261 is a deficient number, since it is larger than the sum of its proper divisors (1).

420328261 is an equidigital number, since it uses as much as digits as its factorization.

420328261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 420328261 is about 20501.9087160196. The cubic root of 420328261 is about 749.0822914653.

The spelling of 420328261 in words is "four hundred twenty million, three hundred twenty-eight thousand, two hundred sixty-one".