81119205 has 16 divisors (see below), whose sum is σ = 144212160. Its totient is φ = 43263504.

The previous prime is 81119201. The next prime is 81119209. The reversal of 81119205 is 50291118.

It is an interprime number because it is at equal distance from previous prime (81119201) and next prime (81119209).

It is not a de Polignac number, because 81119205 - 2² = 81119201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81119201) 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, 300307 + ... + 300576.

It is an arithmetic number, because the mean of its divisors is an integer number (9013260).

Almost surely, 2^81119205 is an apocalyptic number.

It is an amenable number.

81119205 is a deficient number, since it is larger than the sum of its proper divisors (63092955).

81119205 is a wasteful number, since it uses less digits than its factorization.

81119205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600897 (or 600891 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 81119205 is about 9006.6200652631. The cubic root of 81119205 is about 432.8870181181.

The spelling of 81119205 in words is "eighty-one million, one hundred nineteen thousand, two hundred five".