487868981 has 2 divisors, whose sum is σ = 487868982. Its totient is φ = 487868980.

The previous prime is 487868971. The next prime is 487868993. The reversal of 487868981 is 189868784.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270306481 + 217562500 = 16441^2 + 14750^2 .

It is a cyclic number.

It is not a de Polignac number, because 487868981 - 2¹⁴ = 487852597 is a prime.

It is a super-2 number, since 2×487868981² = 476032285243956722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 487868981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (487868971) 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, 243934490 + 243934491.

It is an arithmetic number, because the mean of its divisors is an integer number (243934491).

Almost surely, 2^487868981 is an apocalyptic number.

It is an amenable number.

487868981 is a deficient number, since it is larger than the sum of its proper divisors (1).

487868981 is an equidigital number, since it uses as much as digits as its factorization.

487868981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 59.

The square root of 487868981 is about 22087.7563595762. The cubic root of 487868981 is about 787.2289718543.

The spelling of 487868981 in words is "four hundred eighty-seven million, eight hundred sixty-eight thousand, nine hundred eighty-one".