81103701 has 32 divisors (see below), whose sum is σ = 127687680. Its totient is φ = 44833536.

The previous prime is 81103619. The next prime is 81103721. The reversal of 81103701 is 10730118.

It is not a de Polignac number, because 81103701 - 2⁷ = 81103573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81103721) 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, 82525 + ... + 83501.

It is an arithmetic number, because the mean of its divisors is an integer number (3990240).

Almost surely, 2^81103701 is an apocalyptic number.

It is an amenable number.

81103701 is a deficient number, since it is larger than the sum of its proper divisors (46583979).

81103701 is a wasteful number, since it uses less digits than its factorization.

81103701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 81103701 is about 9005.7593238993. The cubic root of 81103701 is about 432.8594376869.

Adding to 81103701 its reverse (10730118), we get a palindrome (91833819).

It can be divided in two parts, 8110 and 3701, that added together give a palindrome (11811).

The spelling of 81103701 in words is "eighty-one million, one hundred three thousand, seven hundred one".