1549637449 has 2 divisors, whose sum is σ = 1549637450. Its totient is φ = 1549637448.

The previous prime is 1549637447. The next prime is 1549637513. The reversal of 1549637449 is 9447369451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1418878224 + 130759225 = 37668^2 + 11435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1549637449 - 2¹ = 1549637447 is a prime.

Together with 1549637447, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1549637396 and 1549637405.

It is not a weakly prime, because it can be changed into another prime (1549637447) 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, 774818724 + 774818725.

It is an arithmetic number, because the mean of its divisors is an integer number (774818725).

Almost surely, 2^1549637449 is an apocalyptic number.

It is an amenable number.

1549637449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549637449 is an equidigital number, since it uses as much as digits as its factorization.

1549637449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 52.

The square root of 1549637449 is about 39365.4346984763. The cubic root of 1549637449 is about 1157.2042883369.

The spelling of 1549637449 in words is "one billion, five hundred forty-nine million, six hundred thirty-seven thousand, four hundred forty-nine".