81147803 has 24 divisors (see below), whose sum is σ = 96015360. Its totient is φ = 68310000.

The previous prime is 81147799. The next prime is 81147821. The reversal of 81147803 is 30874118.

It is not a de Polignac number, because 81147803 - 2² = 81147799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81147803.

It is not an unprimeable number, because it can be changed into a prime (81147883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107678 + ... + 108428.

It is an arithmetic number, because the mean of its divisors is an integer number (4000640).

Almost surely, 2^81147803 is an apocalyptic number.

81147803 is a deficient number, since it is larger than the sum of its proper divisors (14867557).

81147803 is a wasteful number, since it uses less digits than its factorization.

81147803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81147803 is about 9008.2075353535. The cubic root of 81147803 is about 432.9378825566.

The spelling of 81147803 in words is "eighty-one million, one hundred forty-seven thousand, eight hundred three".