2127866509 has 2 divisors, whose sum is σ = 2127866510. Its totient is φ = 2127866508.

The previous prime is 2127866479. The next prime is 2127866519. The reversal of 2127866509 is 9056687212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1872985284 + 254881225 = 43278^2 + 15965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2127866509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2127866519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063933254 + 1063933255.

It is an arithmetic number, because the mean of its divisors is an integer number (1063933255).

Almost surely, 2^2127866509 is an apocalyptic number.

It is an amenable number.

2127866509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2127866509 is an equidigital number, since it uses as much as digits as its factorization.

2127866509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 2127866509 is about 46128.8034637795. The cubic root of 2127866509 is about 1286.2186220054.

The spelling of 2127866509 in words is "two billion, one hundred twenty-seven million, eight hundred sixty-six thousand, five hundred nine".