1549506149 has 2 divisors, whose sum is σ = 1549506150. Its totient is φ = 1549506148.

The previous prime is 1549506143. The next prime is 1549506151. The reversal of 1549506149 is 9416059451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1520454049 + 29052100 = 38993^2 + 5390^2 .

It is an emirp because it is prime and its reverse (9416059451) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1549506149 is a prime.

It is a Sophie Germain prime.

Together with 1549506151, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1549506143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774753074 + 774753075.

It is an arithmetic number, because the mean of its divisors is an integer number (774753075).

Almost surely, 2^1549506149 is an apocalyptic number.

It is an amenable number.

1549506149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549506149 is an equidigital number, since it uses as much as digits as its factorization.

1549506149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 1549506149 is about 39363.7669564283. The cubic root of 1549506149 is about 1157.1716043018.

The spelling of 1549506149 in words is "one billion, five hundred forty-nine million, five hundred six thousand, one hundred forty-nine".