81191502303 has 8 divisors (see below), whose sum is σ = 108256756608. Its totient is φ = 54126958104.

The previous prime is 81191502283. The next prime is 81191502317. The reversal of 81191502303 is 30320519118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81191502303 - 2⁸ = 81191502047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81191502703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210300 + ... + 454542.

It is an arithmetic number, because the mean of its divisors is an integer number (13532094576).

Almost surely, 2^81191502303 is an apocalyptic number.

81191502303 is a deficient number, since it is larger than the sum of its proper divisors (27065254305).

81191502303 is a wasteful number, since it uses less digits than its factorization.

81191502303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355053.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 81191502303 in words is "eighty-one billion, one hundred ninety-one million, five hundred two thousand, three hundred three".