81113288 has 16 divisors (see below), whose sum is σ = 152343180. Its totient is φ = 40488448.

The previous prime is 81113269. The next prime is 81113297. The reversal of 81113288 is 88231118.

Added to its reverse (88231118) it gives a triangular number (169344406 = T₁₈₄₀₃).

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81036004 + 77284 = 9002^2 + 278^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3281 + ... + 13152.

Almost surely, 2^81113288 is an apocalyptic number.

It is an amenable number.

81113288 is a deficient number, since it is larger than the sum of its proper divisors (71229892).

81113288 is a wasteful number, since it uses less digits than its factorization.

81113288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17056 (or 17052 counting only the distinct ones).

The product of its digits is 3072, while the sum is 32.

The square root of 81113288 is about 9006.2915786688. The cubic root of 81113288 is about 432.8764926420.

Adding to 81113288 its reverse (88231118), we get a triangular number (169344406 = T₁₈₄₀₃).

The spelling of 81113288 in words is "eighty-one million, one hundred thirteen thousand, two hundred eighty-eight".