485431981 has 2 divisors, whose sum is σ = 485431982. Its totient is φ = 485431980.

The previous prime is 485431979. The next prime is 485431993. The reversal of 485431981 is 189134584.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270076356 + 215355625 = 16434^2 + 14675^2 .

It is a cyclic number.

It is not a de Polignac number, because 485431981 - 2¹ = 485431979 is a prime.

It is a super-2 number, since 2×485431981² = 471288416355168722, which contains 22 as substring.

Together with 485431979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (485431381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 242715990 + 242715991.

It is an arithmetic number, because the mean of its divisors is an integer number (242715991).

Almost surely, 2^485431981 is an apocalyptic number.

It is an amenable number.

485431981 is a deficient number, since it is larger than the sum of its proper divisors (1).

485431981 is an equidigital number, since it uses as much as digits as its factorization.

485431981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 43.

The square root of 485431981 is about 22032.5209860334. The cubic root of 485431981 is about 785.9159961978.

The spelling of 485431981 in words is "four hundred eighty-five million, four hundred thirty-one thousand, nine hundred eighty-one".