1549030221 has 12 divisors (see below), whose sum is σ = 2242661148. Its totient is φ = 1030299264.

The previous prime is 1549030211. The next prime is 1549030247. The reversal of 1549030221 is 1220309451.

It can be written as a sum of positive squares in 2 ways, for example, as 784784196 + 764246025 = 28014^2 + 27645^2 .

It is not a de Polignac number, because 1549030221 - 2¹⁰ = 1549029197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1549030211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194850 + ... + 202643.

It is an arithmetic number, because the mean of its divisors is an integer number (186888429).

Almost surely, 2^1549030221 is an apocalyptic number.

It is an amenable number.

1549030221 is a deficient number, since it is larger than the sum of its proper divisors (693630927).

1549030221 is a wasteful number, since it uses less digits than its factorization.

1549030221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397932 (or 397929 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1549030221 is about 39357.7212373887. The cubic root of 1549030221 is about 1157.0531177843.

Adding to 1549030221 its reverse (1220309451), we get a palindrome (2769339672).

The spelling of 1549030221 in words is "one billion, five hundred forty-nine million, thirty thousand, two hundred twenty-one".