1549042049 has 4 divisors (see below), whose sum is σ = 1549172736. Its totient is φ = 1548911364.

The previous prime is 1549042009. The next prime is 1549042073. The reversal of 1549042049 is 9402409451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9402409451 = 167 ⋅56301853.

It is a cyclic number.

It is not a de Polignac number, because 1549042049 - 2¹² = 1549037953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1549042009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45569 + ... + 71934.

It is an arithmetic number, because the mean of its divisors is an integer number (387293184).

Almost surely, 2^1549042049 is an apocalyptic number.

It is an amenable number.

1549042049 is a deficient number, since it is larger than the sum of its proper divisors (130687).

1549042049 is a wasteful number, since it uses less digits than its factorization.

1549042049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130686.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 1549042049 is about 39357.8714998665. The cubic root of 1549042049 is about 1157.0560627644.

The spelling of 1549042049 in words is "one billion, five hundred forty-nine million, forty-two thousand, forty-nine".