988632581 has 2 divisors, whose sum is σ = 988632582. Its totient is φ = 988632580.

The previous prime is 988632577. The next prime is 988632647. The reversal of 988632581 is 185236889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988536481 + 96100 = 31441^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 988632581 - 2² = 988632577 is a prime.

It is a super-3 number, since 3×988632581³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988632511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494316290 + 494316291.

It is an arithmetic number, because the mean of its divisors is an integer number (494316291).

Almost surely, 2^988632581 is an apocalyptic number.

It is an amenable number.

988632581 is a deficient number, since it is larger than the sum of its proper divisors (1).

988632581 is an equidigital number, since it uses as much as digits as its factorization.

988632581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 50.

The square root of 988632581 is about 31442.5282221389. The cubic root of 988632581 is about 996.1964113896.

The spelling of 988632581 in words is "nine hundred eighty-eight million, six hundred thirty-two thousand, five hundred eighty-one".