2185311505 has 32 divisors (see below), whose sum is σ = 2986099200. Its totient is φ = 1521960192.

The previous prime is 2185311503. The next prime is 2185311517. The reversal of 2185311505 is 5051135812.

It is not a de Polignac number, because 2185311505 - 2¹ = 2185311503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2185311503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278952 + ... + 286678.

It is an arithmetic number, because the mean of its divisors is an integer number (93315600).

Almost surely, 2^2185311505 is an apocalyptic number.

It is an amenable number.

2185311505 is a deficient number, since it is larger than the sum of its proper divisors (800787695).

2185311505 is a wasteful number, since it uses less digits than its factorization.

2185311505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7993.

The product of its (nonzero) digits is 6000, while the sum is 31.

The square root of 2185311505 is about 46747.3154844211. The cubic root of 2185311505 is about 1297.6904763532.

The spelling of 2185311505 in words is "two billion, one hundred eighty-five million, three hundred eleven thousand, five hundred five".