988387681 has 2 divisors, whose sum is σ = 988387682. Its totient is φ = 988387680.

The previous prime is 988387651. The next prime is 988387703. The reversal of 988387681 is 186783889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 924707281 + 63680400 = 30409^2 + 7980^2 .

It is a cyclic number.

It is not a de Polignac number, because 988387681 - 2²³ = 979999073 is a prime.

It is a super-2 number, since 2×988387681² = 1953820415905115522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (988387651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494193840 + 494193841.

It is an arithmetic number, because the mean of its divisors is an integer number (494193841).

Almost surely, 2^988387681 is an apocalyptic number.

It is an amenable number.

988387681 is a deficient number, since it is larger than the sum of its proper divisors (1).

988387681 is an equidigital number, since it uses as much as digits as its factorization.

988387681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 58.

The square root of 988387681 is about 31438.6335739962. The cubic root of 988387681 is about 996.1141467028.

The spelling of 988387681 in words is "nine hundred eighty-eight million, three hundred eighty-seven thousand, six hundred eighty-one".