488639981 has 2 divisors, whose sum is σ = 488639982. Its totient is φ = 488639980.

The previous prime is 488639953. The next prime is 488640029. The reversal of 488639981 is 189936884.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477815881 + 10824100 = 21859^2 + 3290^2 .

It is a cyclic number.

It is not a de Polignac number, because 488639981 - 2²² = 484445677 is a prime.

It is a super-2 number, since 2×488639981² = 477538062063360722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (488639941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244319990 + 244319991.

It is an arithmetic number, because the mean of its divisors is an integer number (244319991).

Almost surely, 2^488639981 is an apocalyptic number.

It is an amenable number.

488639981 is a deficient number, since it is larger than the sum of its proper divisors (1).

488639981 is an equidigital number, since it uses as much as digits as its factorization.

488639981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 56.

The square root of 488639981 is about 22105.2025776739. The cubic root of 488639981 is about 787.6434506795.

The spelling of 488639981 in words is "four hundred eighty-eight million, six hundred thirty-nine thousand, nine hundred eighty-one".