81915003 has 32 divisors (see below), whose sum is σ = 125637120. Its totient is φ = 52708320.

The previous prime is 81914999. The next prime is 81915011. The reversal of 81915003 is 30051918.

It is not a de Polignac number, because 81915003 - 2² = 81914999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81915013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166588 + ... + 167078.

It is an arithmetic number, because the mean of its divisors is an integer number (3926160).

Almost surely, 2^81915003 is an apocalyptic number.

81915003 is a deficient number, since it is larger than the sum of its proper divisors (43722117).

81915003 is a wasteful number, since it uses less digits than its factorization.

81915003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 81915003 is about 9050.6907471198. The cubic root of 81915003 is about 434.2979877824.

The spelling of 81915003 in words is "eighty-one million, nine hundred fifteen thousand, three".