81071107 has 16 divisors (see below), whose sum is σ = 92576512. Its totient is φ = 70450560.

The previous prime is 81071077. The next prime is 81071129. The reversal of 81071107 is 70117018.

It is a cyclic number.

It is not a de Polignac number, because 81071107 - 2²³ = 72682499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81071707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12193 + ... + 17629.

It is an arithmetic number, because the mean of its divisors is an integer number (5786032).

Almost surely, 2^81071107 is an apocalyptic number.

81071107 is a deficient number, since it is larger than the sum of its proper divisors (11505405).

81071107 is a wasteful number, since it uses less digits than its factorization.

81071107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518.

The product of its (nonzero) digits is 392, while the sum is 25.

The square root of 81071107 is about 9003.9495222930. The cubic root of 81071107 is about 432.8014439877.

It can be divided in two parts, 810 and 71107, that added together give a palindrome (71917).

The spelling of 81071107 in words is "eighty-one million, seventy-one thousand, one hundred seven".