9657891 has 6 divisors (see below), whose sum is σ = 13950300. Its totient is φ = 6438588.

The previous prime is 9657881. The next prime is 9657937. The reversal of 9657891 is 1987569.

9657891 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9657891 - 2⁷ = 9657763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9657811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 536541 + ... + 536558.

It is an arithmetic number, because the mean of its divisors is an integer number (2325050).

Almost surely, 2^9657891 is an apocalyptic number.

9657891 is a deficient number, since it is larger than the sum of its proper divisors (4292409).

9657891 is a wasteful number, since it uses less digits than its factorization.

9657891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073105 (or 1073102 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 9657891 is about 3107.7147552502. The cubic root of 9657891 is about 212.9580688471.

It can be divided in two parts, 96578 and 91, that added together give a palindrome (96669).

The spelling of 9657891 in words is "nine million, six hundred fifty-seven thousand, eight hundred ninety-one".