2102549 has 2 divisors, whose sum is σ = 2102550. Its totient is φ = 2102548.

The previous prime is 2102533. The next prime is 2102557. The reversal of 2102549 is 9452012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2102500 + 49 = 1450^2 + 7^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102549 - 2⁴ = 2102533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051274 + 1051275.

It is an arithmetic number, because the mean of its divisors is an integer number (1051275).

2^2102549 is an apocalyptic number.

It is an amenable number.

2102549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102549 is an equidigital number, since it uses as much as digits as its factorization.

2102549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2102549 is about 1450.0168964533. The cubic root of 2102549 is about 128.1097081889.

It can be divided in two parts, 21025 and 49, that multiplied together give a square (1030225 = 1015²).

The spelling of 2102549 in words is "two million, one hundred two thousand, five hundred forty-nine".