71109811 has 4 divisors (see below), whose sum is σ = 72083992. Its totient is φ = 70135632.

The previous prime is 71109751. The next prime is 71109817. The reversal of 71109811 is 11890117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11890117 = 173 ⋅68729.

It is a cyclic number.

It is not a de Polignac number, because 71109811 - 2⁷ = 71109683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71109811.

It is not an unprimeable number, because it can be changed into a prime (71109817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486981 + ... + 487126.

It is an arithmetic number, because the mean of its divisors is an integer number (18020998).

Almost surely, 2^71109811 is an apocalyptic number.

71109811 is a deficient number, since it is larger than the sum of its proper divisors (974181).

71109811 is an equidigital number, since it uses as much as digits as its factorization.

71109811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974180.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 71109811 is about 8432.6633396573. The cubic root of 71109811 is about 414.2951426029.

Adding to 71109811 its reverse (11890117), we get a palindrome (82999928).

It can be divided in two parts, 7 and 1109811, that multiplied together give a palindrome (7768677).

The spelling of 71109811 in words is "seventy-one million, one hundred nine thousand, eight hundred eleven".