81111305 has 8 divisors (see below), whose sum is σ = 106182144. Its totient is φ = 58990000.

The previous prime is 81111269. The next prime is 81111313. The reversal of 81111305 is 50311118.

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

It is not a de Polignac number, because 81111305 - 2⁶ = 81111241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737321 + ... + 737430.

It is an arithmetic number, because the mean of its divisors is an integer number (13272768).

Almost surely, 2^81111305 is an apocalyptic number.

It is an amenable number.

81111305 is a deficient number, since it is larger than the sum of its proper divisors (25070839).

81111305 is a wasteful number, since it uses less digits than its factorization.

81111305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474767.

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 81111305 is about 9006.1814882890. The cubic root of 81111305 is about 432.8729650610.

The spelling of 81111305 in words is "eighty-one million, one hundred eleven thousand, three hundred five".