2005361987 has 2 divisors, whose sum is σ = 2005361988. Its totient is φ = 2005361986.

The previous prime is 2005361983. The next prime is 2005361989. The reversal of 2005361987 is 7891635002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2005361987 - 2² = 2005361983 is a prime.

Together with 2005361989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2005361983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002680993 + 1002680994.

It is an arithmetic number, because the mean of its divisors is an integer number (1002680994).

Almost surely, 2^2005361987 is an apocalyptic number.

2005361987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005361987 is an equidigital number, since it uses as much as digits as its factorization.

2005361987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 2005361987 is about 44781.2682602894. The cubic root of 2005361987 is about 1261.0459918874.

Adding to 2005361987 its reverse (7891635002), we get a palindrome (9896996989).

The spelling of 2005361987 in words is "two billion, five million, three hundred sixty-one thousand, nine hundred eighty-seven".