2005402261 has 2 divisors, whose sum is σ = 2005402262. Its totient is φ = 2005402260.

The previous prime is 2005402249. The next prime is 2005402277. The reversal of 2005402261 is 1622045002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1701562500 + 303839761 = 41250^2 + 17431^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005402261 - 2²⁷ = 1871184533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2005402561) 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 as a sum of consecutive naturals, namely, 1002701130 + 1002701131.

It is an arithmetic number, because the mean of its divisors is an integer number (1002701131).

Almost surely, 2^2005402261 is an apocalyptic number.

It is an amenable number.

2005402261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005402261 is an equidigital number, since it uses as much as digits as its factorization.

2005402261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2005402261 is about 44781.7179326564. The cubic root of 2005402261 is about 1261.0544337592.

Adding to 2005402261 its reverse (1622045002), we get a palindrome (3627447263).

The spelling of 2005402261 in words is "two billion, five million, four hundred two thousand, two hundred sixty-one".