2081505811 has 8 divisors (see below), whose sum is σ = 2595124224. Its totient is φ = 1621952520.

The previous prime is 2081505809. The next prime is 2081505821. The reversal of 2081505811 is 1185051802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2081505811 - 2¹ = 2081505809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2081505821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13516195 + ... + 13516348.

It is an arithmetic number, because the mean of its divisors is an integer number (324390528).

Almost surely, 2^2081505811 is an apocalyptic number.

2081505811 is a deficient number, since it is larger than the sum of its proper divisors (513618413).

2081505811 is a wasteful number, since it uses less digits than its factorization.

2081505811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27032561.

The product of its (nonzero) digits is 3200, while the sum is 31.

The square root of 2081505811 is about 45623.5225623800. The cubic root of 2081505811 is about 1276.8088253766.

The spelling of 2081505811 in words is "two billion, eighty-one million, five hundred five thousand, eight hundred eleven".