2186149549 has 2 divisors, whose sum is σ = 2186149550. Its totient is φ = 2186149548.

The previous prime is 2186149547. The next prime is 2186149577. The reversal of 2186149549 is 9459416812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1154776324 + 1031373225 = 33982^2 + 32115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2186149549 - 2¹ = 2186149547 is a prime.

Together with 2186149547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2186149547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093074774 + 1093074775.

It is an arithmetic number, because the mean of its divisors is an integer number (1093074775).

Almost surely, 2^2186149549 is an apocalyptic number.

It is an amenable number.

2186149549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2186149549 is an equidigital number, since it uses as much as digits as its factorization.

2186149549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The square root of 2186149549 is about 46756.2781773742. The cubic root of 2186149549 is about 1297.8563387069.

The spelling of 2186149549 in words is "two billion, one hundred eighty-six million, one hundred forty-nine thousand, five hundred forty-nine".