9691021 has 4 divisors (see below), whose sum is σ = 9740412. Its totient is φ = 9641632.

The previous prime is 9691001. The next prime is 9691061. The reversal of 9691021 is 1201969.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8037225 + 1653796 = 2835^2 + 1286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9691021 is a prime.

It is a Duffinian number.

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 (9691001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24400 + ... + 24793.

It is an arithmetic number, because the mean of its divisors is an integer number (2435103).

Almost surely, 2^9691021 is an apocalyptic number.

It is an amenable number.

9691021 is a deficient number, since it is larger than the sum of its proper divisors (49391).

9691021 is a wasteful number, since it uses less digits than its factorization.

9691021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49390.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 9691021 is about 3113.0404751625. The cubic root of 9691021 is about 213.2012982355.

The spelling of 9691021 in words is "nine million, six hundred ninety-one thousand, twenty-one".