81383132 has 24 divisors (see below), whose sum is σ = 146168064. Its totient is φ = 39629552.

The previous prime is 81383119. The next prime is 81383147. The reversal of 81383132 is 23138318.

It is a junction number, because it is equal to n+sod(n) for n = 81383095 and 81383104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41723 + ... + 43629.

It is an arithmetic number, because the mean of its divisors is an integer number (6090336).

Almost surely, 2^81383132 is an apocalyptic number.

It is an amenable number.

81383132 is a deficient number, since it is larger than the sum of its proper divisors (64784932).

81383132 is a wasteful number, since it uses less digits than its factorization.

81383132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185 (or 2183 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 81383132 is about 9021.2600006873. The cubic root of 81383132 is about 433.3559859296.

The spelling of 81383132 in words is "eighty-one million, three hundred eighty-three thousand, one hundred thirty-two".