2165140249 has 2 divisors, whose sum is σ = 2165140250. Its totient is φ = 2165140248.

The previous prime is 2165140217. The next prime is 2165140273. The reversal of 2165140249 is 9420415612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1214034649 + 951105600 = 34843^2 + 30840^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165140249 - 2⁵ = 2165140217 is a prime.

It is not a weakly prime, because it can be changed into another prime (2165140049) 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, 1082570124 + 1082570125.

It is an arithmetic number, because the mean of its divisors is an integer number (1082570125).

Almost surely, 2^2165140249 is an apocalyptic number.

It is an amenable number.

2165140249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165140249 is an equidigital number, since it uses as much as digits as its factorization.

2165140249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2165140249 is about 46531.0675678089. The cubic root of 2165140249 is about 1293.6854026916.

The spelling of 2165140249 in words is "two billion, one hundred sixty-five million, one hundred forty thousand, two hundred forty-nine".