82081909001 has 4 divisors (see below), whose sum is σ = 84300339012. Its totient is φ = 79863478992.

The previous prime is 82081908991. The next prime is 82081909003. The reversal of 82081909001 is 10090918028.

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

It can be written as a sum of positive squares in 2 ways, for example, as 59731360000 + 22350549001 = 244400^2 + 149501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82081909001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82081909003) 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, 1109214950 + ... + 1109215023.

It is an arithmetic number, because the mean of its divisors is an integer number (21075084753).

Almost surely, 2^82081909001 is an apocalyptic number.

It is an amenable number.

82081909001 is a deficient number, since it is larger than the sum of its proper divisors (2218430011).

82081909001 is a wasteful number, since it uses less digits than its factorization.

82081909001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218430010.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 82081909001 in words is "eighty-two billion, eighty-one million, nine hundred nine thousand, one".