81110747 has 4 divisors (see below), whose sum is σ = 81183720. Its totient is φ = 81037776.

The previous prime is 81110699. The next prime is 81110761. The reversal of 81110747 is 74701118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81110747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81110797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34793 + ... + 37050.

It is an arithmetic number, because the mean of its divisors is an integer number (20295930).

Almost surely, 2^81110747 is an apocalyptic number.

81110747 is a deficient number, since it is larger than the sum of its proper divisors (72973).

81110747 is a wasteful number, since it uses less digits than its factorization.

81110747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72972.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 81110747 is about 9006.1505095129. The cubic root of 81110747 is about 432.8719724181.

The spelling of 81110747 in words is "eighty-one million, one hundred ten thousand, seven hundred forty-seven".