81084903 has 4 divisors (see below), whose sum is σ = 108113208. Its totient is φ = 54056600.

The previous prime is 81084901. The next prime is 81084929. The reversal of 81084903 is 30948018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81084903 - 2¹ = 81084901 is a prime.

It is a super-2 number, since 2×81084903² = 13149522989038818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81084901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13514148 + ... + 13514153.

It is an arithmetic number, because the mean of its divisors is an integer number (27028302).

Almost surely, 2^81084903 is an apocalyptic number.

81084903 is a deficient number, since it is larger than the sum of its proper divisors (27028305).

81084903 is a wasteful number, since it uses less digits than its factorization.

81084903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27028304.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81084903 is about 9004.7155979520. The cubic root of 81084903 is about 432.8259927666.

The spelling of 81084903 in words is "eighty-one million, eighty-four thousand, nine hundred three".