9121969081 has 9 divisors (see below), whose sum is σ = 9197950573. Its totient is φ = 9046612480.

The previous prime is 9121969067. The next prime is 9121969099. The reversal of 9121969081 is 1809691219.

The square root of 9121969081 is 95509.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 9357481 + 9112611600 = 3059^2 + 95460^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9121969081 is a prime.

It is a super-2 number, since 2×9121969081² (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 (9121969061) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14230521 + ... + 14231161.

Almost surely, 2^9121969081 is an apocalyptic number.

9121969081 is the 95509-th square number.

9121969081 is the 47755-th centered octagonal number.

It is an amenable number.

9121969081 is a deficient number, since it is larger than the sum of its proper divisors (75981492).

9121969081 is an frugal number, since it uses more digits than its factorization.

9121969081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 46.

The cubic root of 9121969081 is about 2089.4382074813.

The spelling of 9121969081 in words is "nine billion, one hundred twenty-one million, nine hundred sixty-nine thousand, eighty-one".