9699991 has 6 divisors (see below), whose sum is σ = 11283720. Its totient is φ = 8314236.

The previous prime is 9699973. The next prime is 9700003. The reversal of 9699991 is 1999969.

It is not a de Polignac number, because 9699991 - 2⁵ = 9699959 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9699941) 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, 98931 + ... + 99028.

It is an arithmetic number, because the mean of its divisors is an integer number (1880620).

Almost surely, 2^9699991 is an apocalyptic number.

9699991 is a deficient number, since it is larger than the sum of its proper divisors (1583729).

9699991 is a wasteful number, since it uses less digits than its factorization.

9699991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197973 (or 197966 counting only the distinct ones).

The product of its digits is 354294, while the sum is 52.

The square root of 9699991 is about 3114.4808556162. The cubic root of 9699991 is about 213.2670575917.

The spelling of 9699991 in words is "nine million, six hundred ninety-nine thousand, nine hundred ninety-one".