2005101251 has 4 divisors (see below), whose sum is σ = 2008767432. Its totient is φ = 2001435072.

The previous prime is 2005101239. The next prime is 2005101277. The reversal of 2005101251 is 1521015002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2005101251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2005104251) 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 in 3 ways as a sum of consecutive naturals, for example, 1832270 + ... + 1833363.

It is an arithmetic number, because the mean of its divisors is an integer number (502191858).

Almost surely, 2^2005101251 is an apocalyptic number.

2005101251 is a deficient number, since it is larger than the sum of its proper divisors (3666181).

2005101251 is an equidigital number, since it uses as much as digits as its factorization.

2005101251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3666180.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 2005101251 is about 44778.3569484187. The cubic root of 2005101251 is about 1260.9913360296.

Adding to 2005101251 its reverse (1521015002), we get a palindrome (3526116253).

The spelling of 2005101251 in words is "two billion, five million, one hundred one thousand, two hundred fifty-one".