9771621 has 16 divisors (see below), whose sum is σ = 13432320. Its totient is φ = 6315120.

The previous prime is 9771613. The next prime is 9771631. The reversal of 9771621 is 1261779.

It is not a de Polignac number, because 9771621 - 2³ = 9771613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9771611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27040 + ... + 27398.

It is an arithmetic number, because the mean of its divisors is an integer number (839520).

Almost surely, 2^9771621 is an apocalyptic number.

It is an amenable number.

9771621 is a deficient number, since it is larger than the sum of its proper divisors (3660699).

9771621 is a wasteful number, since it uses less digits than its factorization.

9771621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616.

The product of its digits is 5292, while the sum is 33.

The square root of 9771621 is about 3125.9592127857. The cubic root of 9771621 is about 213.7907305850.

The spelling of 9771621 in words is "nine million, seven hundred seventy-one thousand, six hundred twenty-one".