81003138 has 16 divisors (see below), whose sum is σ = 166385280. Its totient is φ = 26271216.

The previous prime is 81003127. The next prime is 81003151. The reversal of 81003138 is 83130018.

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, 182218 + ... + 182661.

It is an arithmetic number, because the mean of its divisors is an integer number (10399080).

Almost surely, 2^81003138 is an apocalyptic number.

81003138 is an abundant number, since it is smaller than the sum of its proper divisors (85382142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81003138 is a wasteful number, since it uses less digits than its factorization.

81003138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364921.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 81003138 is about 9000.1743316449. The cubic root of 81003138 is about 432.6804584017.

The spelling of 81003138 in words is "eighty-one million, three thousand, one hundred thirty-eight".