2185961587 has 4 divisors (see below), whose sum is σ = 2232471456. Its totient is φ = 2139451720.

The previous prime is 2185961579. The next prime is 2185961593. The reversal of 2185961587 is 7851695812.

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

It is a cyclic number.

It is not a de Polignac number, because 2185961587 - 2³ = 2185961579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2185961527) 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, 23254864 + ... + 23254957.

It is an arithmetic number, because the mean of its divisors is an integer number (558117864).

Almost surely, 2^2185961587 is an apocalyptic number.

2185961587 is a deficient number, since it is larger than the sum of its proper divisors (46509869).

2185961587 is an equidigital number, since it uses as much as digits as its factorization.

2185961587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46509868.

The product of its digits is 1209600, while the sum is 52.

The square root of 2185961587 is about 46754.2681153283. The cubic root of 2185961587 is about 1297.8191416992.

The spelling of 2185961587 in words is "two billion, one hundred eighty-five million, nine hundred sixty-one thousand, five hundred eighty-seven".