9561172769 has 4 divisors (see below), whose sum is σ = 9561789744. Its totient is φ = 9560555796.

The previous prime is 9561172763. The next prime is 9561172847. The reversal of 9561172769 is 9672711659.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9672711659 = 13 ⋅744054743.

It is a cyclic number.

It is not a de Polignac number, because 9561172769 - 2²⁸ = 9292737313 is a prime.

It is a super-2 number, since 2×9561172769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9561172769.

It is not an unprimeable number, because it can be changed into a prime (9561172763) 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, 284627 + ... + 316440.

It is an arithmetic number, because the mean of its divisors is an integer number (2390447436).

Almost surely, 2^9561172769 is an apocalyptic number.

It is an amenable number.

9561172769 is a deficient number, since it is larger than the sum of its proper divisors (616975).

9561172769 is a wasteful number, since it uses less digits than its factorization.

9561172769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616974.

The product of its digits is 1428840, while the sum is 53.

The square root of 9561172769 is about 97781.2495778204. The cubic root of 9561172769 is about 2122.4479827689.

The spelling of 9561172769 in words is "nine billion, five hundred sixty-one million, one hundred seventy-two thousand, seven hundred sixty-nine".