9621691 has 4 divisors (see below), whose sum is σ = 9627984. Its totient is φ = 9615400.

The previous prime is 9621683. The next prime is 9621697. The reversal of 9621691 is 1961269.

9621691 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1961269 = 677 ⋅2897.

It is a cyclic number.

It is not a de Polignac number, because 9621691 - 2³ = 9621683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9621697) 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, 786 + ... + 4456.

It is an arithmetic number, because the mean of its divisors is an integer number (2406996).

Almost surely, 2^9621691 is an apocalyptic number.

9621691 is a deficient number, since it is larger than the sum of its proper divisors (6293).

9621691 is a wasteful number, since it uses less digits than its factorization.

9621691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6292.

The product of its digits is 5832, while the sum is 34.

The square root of 9621691 is about 3101.8850720167. The cubic root of 9621691 is about 212.6916637557.

The spelling of 9621691 in words is "nine million, six hundred twenty-one thousand, six hundred ninety-one".