2186642261 has 2 divisors, whose sum is σ = 2186642262. Its totient is φ = 2186642260.

The previous prime is 2186642251. The next prime is 2186642327. The reversal of 2186642261 is 1622466812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1936528036 + 250114225 = 44006^2 + 15815^2 .

It is a cyclic number.

It is not a de Polignac number, because 2186642261 - 2¹⁴ = 2186625877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2186642251) 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, 1093321130 + 1093321131.

It is an arithmetic number, because the mean of its divisors is an integer number (1093321131).

Almost surely, 2^2186642261 is an apocalyptic number.

It is an amenable number.

2186642261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2186642261 is an equidigital number, since it uses as much as digits as its factorization.

2186642261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 38.

The square root of 2186642261 is about 46761.5468200101. The cubic root of 2186642261 is about 1297.9538345313.

The spelling of 2186642261 in words is "two billion, one hundred eighty-six million, six hundred forty-two thousand, two hundred sixty-one".