81004132 has 12 divisors (see below), whose sum is σ = 154644336. Its totient is φ = 36820040.

The previous prime is 81004129. The next prime is 81004141. The reversal of 81004132 is 23140018.

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, 920458 + ... + 920545.

It is an arithmetic number, because the mean of its divisors is an integer number (12887028).

Almost surely, 2^81004132 is an apocalyptic number.

It is an amenable number.

81004132 is a deficient number, since it is larger than the sum of its proper divisors (73640204).

81004132 is a wasteful number, since it uses less digits than its factorization.

81004132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841018 (or 1841016 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 81004132 is about 9000.2295526281. The cubic root of 81004132 is about 432.6822282205.

The spelling of 81004132 in words is "eighty-one million, four thousand, one hundred thirty-two".