488861981 has 2 divisors, whose sum is σ = 488861982. Its totient is φ = 488861980.

The previous prime is 488861957. The next prime is 488862041. The reversal of 488861981 is 189168884.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476548900 + 12313081 = 21830^2 + 3509^2 .

It is a cyclic number.

It is not a de Polignac number, because 488861981 - 2¹⁴ = 488845597 is a prime.

It is a super-2 number, since 2×488861981² = 477972072934488722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (488861951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244430990 + 244430991.

It is an arithmetic number, because the mean of its divisors is an integer number (244430991).

Almost surely, 2^488861981 is an apocalyptic number.

It is an amenable number.

488861981 is a deficient number, since it is larger than the sum of its proper divisors (1).

488861981 is an equidigital number, since it uses as much as digits as its factorization.

488861981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 53.

The square root of 488861981 is about 22110.2234497981. The cubic root of 488861981 is about 787.7627139265.

The spelling of 488861981 in words is "four hundred eighty-eight million, eight hundred sixty-one thousand, nine hundred eighty-one".