2101549 has 2 divisors, whose sum is σ = 2101550. Its totient is φ = 2101548.

The previous prime is 2101531. The next prime is 2101553. The reversal of 2101549 is 9451012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1841449 + 260100 = 1357^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101549 - 2²¹ = 4397 is a prime.

It is equal to p₁₅₅₉₂₀ and since 2101549 and 155920 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101249) 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, 1050774 + 1050775.

It is an arithmetic number, because the mean of its divisors is an integer number (1050775).

2^2101549 is an apocalyptic number.

It is an amenable number.

2101549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101549 is an equidigital number, since it uses as much as digits as its factorization.

2101549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 2101549 is about 1449.6720318748. The cubic root of 2101549 is about 128.0893947465.

The spelling of 2101549 in words is "two million, one hundred one thousand, five hundred forty-nine".