1008988681 has 2 divisors, whose sum is σ = 1008988682. Its totient is φ = 1008988680.

The previous prime is 1008988661. The next prime is 1008988691. The reversal of 1008988681 is 1868898001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 991683081 + 17305600 = 31491^2 + 4160^2 .

It is an emirp because it is prime and its reverse (1868898001) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1898868001 and 1008688981.

It is a cyclic number.

It is not a de Polignac number, because 1008988681 - 2⁵ = 1008988649 is a prime.

It is a super-2 number, since 2×1008988681² = 2036116316772239522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1008988661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504494340 + 504494341.

It is an arithmetic number, because the mean of its divisors is an integer number (504494341).

Almost surely, 2^1008988681 is an apocalyptic number.

It is an amenable number.

1008988681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1008988681 is an equidigital number, since it uses as much as digits as its factorization.

1008988681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 49.

The square root of 1008988681 is about 31764.5821788986. The cubic root of 1008988681 is about 1002.9872941873.

The spelling of 1008988681 in words is "one billion, eight million, nine hundred eighty-eight thousand, six hundred eighty-one".