427789081 has 2 divisors, whose sum is σ = 427789082. Its totient is φ = 427789080.

The previous prime is 427789001. The next prime is 427789097. The reversal of 427789081 is 180987724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421932681 + 5856400 = 20541^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 427789081 - 2¹³ = 427780889 is a prime.

It is a super-2 number, since 2×427789081² = 366006995645649122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (427789001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213894540 + 213894541.

It is an arithmetic number, because the mean of its divisors is an integer number (213894541).

Almost surely, 2^427789081 is an apocalyptic number.

It is an amenable number.

427789081 is a deficient number, since it is larger than the sum of its proper divisors (1).

427789081 is an equidigital number, since it uses as much as digits as its factorization.

427789081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 427789081 is about 20683.0626600608. The cubic root of 427789081 is about 753.4883902815.

The spelling of 427789081 in words is "four hundred twenty-seven million, seven hundred eighty-nine thousand, eighty-one".