81156803 has 16 divisors (see below), whose sum is σ = 100294656. Its totient is φ = 63948960.

The previous prime is 81156773. The next prime is 81156821. The reversal of 81156803 is 30865118.

It is a cyclic number.

It is not a de Polignac number, because 81156803 - 2⁶ = 81156739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81156803.

It is not an unprimeable number, because it can be changed into a prime (81156883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22238 + ... + 25628.

It is an arithmetic number, because the mean of its divisors is an integer number (6268416).

Almost surely, 2^81156803 is an apocalyptic number.

81156803 is a deficient number, since it is larger than the sum of its proper divisors (19137853).

81156803 is a wasteful number, since it uses less digits than its factorization.

81156803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 81156803 is about 9008.7070659446. The cubic root of 81156803 is about 432.9538874955.

The spelling of 81156803 in words is "eighty-one million, one hundred fifty-six thousand, eight hundred three".