10897781 has 2 divisors, whose sum is σ = 10897782. Its totient is φ = 10897780.

The previous prime is 10897769. The next prime is 10897801. The reversal of 10897781 is 18779801.

10897781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10023556 + 874225 = 3166^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 10897781 - 2⁶ = 10897717 is a prime.

It is a super-2 number, since 2×10897781² = 237523261447922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10897741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5448890 + 5448891.

It is an arithmetic number, because the mean of its divisors is an integer number (5448891).

Almost surely, 2^10897781 is an apocalyptic number.

It is an amenable number.

10897781 is a deficient number, since it is larger than the sum of its proper divisors (1).

10897781 is an equidigital number, since it uses as much as digits as its factorization.

10897781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 10897781 is about 3301.1787288785. The cubic root of 10897781 is about 221.7069761682.

The spelling of 10897781 in words is "ten million, eight hundred ninety-seven thousand, seven hundred eighty-one".