9765552221 has 4 divisors (see below), whose sum is σ = 10190141472. Its totient is φ = 9340962972.

The previous prime is 9765552217. The next prime is 9765552253. The reversal of 9765552221 is 1222555679.

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 not a de Polignac number, because 9765552221 - 2² = 9765552217 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9765552521) 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, 212294591 + ... + 212294636.

It is an arithmetic number, because the mean of its divisors is an integer number (2547535368).

Almost surely, 2^9765552221 is an apocalyptic number.

It is an amenable number.

9765552221 is a deficient number, since it is larger than the sum of its proper divisors (424589251).

9765552221 is a wasteful number, since it uses less digits than its factorization.

9765552221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424589250.

The product of its digits is 378000, while the sum is 44.

The square root of 9765552221 is about 98820.8086437264. The cubic root of 9765552221 is about 2137.4646234515.

The spelling of 9765552221 in words is "nine billion, seven hundred sixty-five million, five hundred fifty-two thousand, two hundred twenty-one".