9778897 has 2 divisors, whose sum is σ = 9778898. Its totient is φ = 9778896.

The previous prime is 9778891. The next prime is 9778913. The reversal of 9778897 is 7988779.

9778897 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., 6765201 + 3013696 = 2601^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 9778897 - 2³ = 9778889 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9778891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4889448 + 4889449.

It is an arithmetic number, because the mean of its divisors is an integer number (4889449).

Almost surely, 2^9778897 is an apocalyptic number.

It is an amenable number.

9778897 is a deficient number, since it is larger than the sum of its proper divisors (1).

9778897 is an equidigital number, since it uses as much as digits as its factorization.

9778897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 55.

The square root of 9778897 is about 3127.1227989959. The cubic root of 9778897 is about 213.8437806514.

The spelling of 9778897 in words is "nine million, seven hundred seventy-eight thousand, eight hundred ninety-seven".