420875881 has 2 divisors, whose sum is σ = 420875882. Its totient is φ = 420875880.

The previous prime is 420875857. The next prime is 420875911. The reversal of 420875881 is 188578024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397643481 + 23232400 = 19941^2 + 4820^2 .

It is a cyclic number.

It is not a de Polignac number, because 420875881 - 2⁵ = 420875849 is a prime.

It is a super-2 number, since 2×420875881² = 354273014415052322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420875801) 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, 210437940 + 210437941.

It is an arithmetic number, because the mean of its divisors is an integer number (210437941).

Almost surely, 2^420875881 is an apocalyptic number.

It is an amenable number.

420875881 is a deficient number, since it is larger than the sum of its proper divisors (1).

420875881 is an equidigital number, since it uses as much as digits as its factorization.

420875881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 143360, while the sum is 43.

The square root of 420875881 is about 20515.2597107616. The cubic root of 420875881 is about 749.4074614689.

It can be divided in two parts, 4208 and 75881, that added together give a square (80089 = 283²).

The spelling of 420875881 in words is "four hundred twenty million, eight hundred seventy-five thousand, eight hundred eighty-one".