81120209332 has 12 divisors (see below), whose sum is σ = 141963568516. Its totient is φ = 40559189760.

The previous prime is 81120209327. The next prime is 81120209353. The reversal of 81120209332 is 23390202118.

It can be written as a sum of positive squares in 2 ways, for example, as 37265985936 + 43854223396 = 193044^2 + 209414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81120209294 and 81120209303.

It is a congruent number.

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, 4893 + ... + 402820.

Almost surely, 2^81120209332 is an apocalyptic number.

It is an amenable number.

81120209332 is a deficient number, since it is larger than the sum of its proper divisors (60843359184).

81120209332 is a wasteful number, since it uses less digits than its factorization.

81120209332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457458 (or 457456 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 81120209332 in words is "eighty-one billion, one hundred twenty million, two hundred nine thousand, three hundred thirty-two".