9775621 has 4 divisors (see below), whose sum is σ = 10200672. Its totient is φ = 9350572.

The previous prime is 9775609. The next prime is 9775637. The reversal of 9775621 is 1265779.

9775621 is digitally balanced in base 3, because in such base 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9775621 is a prime.

It is a Duffinian number.

9775621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9775021) 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, 212491 + ... + 212536.

It is an arithmetic number, because the mean of its divisors is an integer number (2550168).

Almost surely, 2^9775621 is an apocalyptic number.

It is an amenable number.

9775621 is a deficient number, since it is larger than the sum of its proper divisors (425051).

9775621 is a wasteful number, since it uses less digits than its factorization.

9775621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425050.

The product of its digits is 26460, while the sum is 37.

The square root of 9775621 is about 3126.5989509369. The cubic root of 9775621 is about 213.8198982555.

The spelling of 9775621 in words is "nine million, seven hundred seventy-five thousand, six hundred twenty-one".