2005402251 has 8 divisors (see below), whose sum is σ = 2730760704. Its totient is φ = 1308489320.

The previous prime is 2005402249. The next prime is 2005402261. The reversal of 2005402251 is 1522045002.

It is a happy number.

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 2005402251 - 2¹ = 2005402249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2005402261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7111215 + ... + 7111496.

It is an arithmetic number, because the mean of its divisors is an integer number (341345088).

Almost surely, 2^2005402251 is an apocalyptic number.

2005402251 is a deficient number, since it is larger than the sum of its proper divisors (725358453).

2005402251 is a wasteful number, since it uses less digits than its factorization.

2005402251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14222761.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 2005402251 is about 44781.7178210037. The cubic root of 2005402251 is about 1261.0544316631.

Adding to 2005402251 its reverse (1522045002), we get a palindrome (3527447253).

The spelling of 2005402251 in words is "two billion, five million, four hundred two thousand, two hundred fifty-one".