1009689881 has 2 divisors, whose sum is σ = 1009689882. Its totient is φ = 1009689880.

The previous prime is 1009689853. The next prime is 1009689883. The reversal of 1009689881 is 1889869001.

It is a happy number.

1009689881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 920576281 + 89113600 = 30341^2 + 9440^2 .

It is an emirp because it is prime and its reverse (1889869001) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1886896001 and 1006986881.

It is a cyclic number.

It is not a de Polignac number, because 1009689881 - 2⁶ = 1009689817 is a prime.

It is a super-2 number, since 2×1009689881² = 2038947311587588322, which contains 22 as substring.

Together with 1009689883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1009689883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504844940 + 504844941.

It is an arithmetic number, because the mean of its divisors is an integer number (504844941).

Almost surely, 2^1009689881 is an apocalyptic number.

It is an amenable number.

1009689881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009689881 is an equidigital number, since it uses as much as digits as its factorization.

1009689881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 50.

The square root of 1009689881 is about 31775.6177123278. The cubic root of 1009689881 is about 1003.2195834910.

The spelling of 1009689881 in words is "one billion, nine million, six hundred eighty-nine thousand, eight hundred eighty-one".