9690471891 has 24 divisors (see below), whose sum is σ = 14311425024. Its totient is φ = 6315669360.

The previous prime is 9690471863. The next prime is 9690471949. The reversal of 9690471891 is 1981740969.

9690471891 is a `hidden beast` number, since 9 + 6 + 90 + 471 + 89 + 1 = 666.

9690471891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9690471891 - 2⁹ = 9690471379 is a prime.

It is a super-2 number, since 2×9690471891² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9690471821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 372780 + ... + 397926.

It is an arithmetic number, because the mean of its divisors is an integer number (596309376).

Almost surely, 2^9690471891 is an apocalyptic number.

9690471891 is a deficient number, since it is larger than the sum of its proper divisors (4620953133).

9690471891 is a wasteful number, since it uses less digits than its factorization.

9690471891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26111 (or 26108 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 9690471891 is about 98440.1944888367. The cubic root of 9690471891 is about 2131.9727138208.

The spelling of 9690471891 in words is "nine billion, six hundred ninety million, four hundred seventy-one thousand, eight hundred ninety-one".