9169651681 has 8 divisors (see below), whose sum is σ = 9396037224. Its totient is φ = 8943396480.

The previous prime is 9169651669. The next prime is 9169651703. The reversal of 9169651681 is 1861569619.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 98803600 + 9070848081 = 9940^2 + 95241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9169651681 - 2⁵ = 9169651649 is a prime.

It is a super-2 number, since 2×9169651681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9169651181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118371 + ... + 179863.

It is an arithmetic number, because the mean of its divisors is an integer number (1174504653).

Almost surely, 2^9169651681 is an apocalyptic number.

It is an amenable number.

9169651681 is a deficient number, since it is larger than the sum of its proper divisors (226385543).

9169651681 is a wasteful number, since it uses less digits than its factorization.

9169651681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65171.

The product of its digits is 699840, while the sum is 52.

The square root of 9169651681 is about 95758.2982357143. The cubic root of 9169651681 is about 2093.0725380312.

The spelling of 9169651681 in words is "nine billion, one hundred sixty-nine million, six hundred fifty-one thousand, six hundred eighty-one".