549131121 has 24 divisors (see below), whose sum is σ = 988912704. Its totient is φ = 285262560.

The previous prime is 549131119. The next prime is 549131123. The reversal of 549131121 is 121131945.

It is a happy number.

549131121 is a `hidden beast` number, since 549 + 1 + 3 + 112 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (549131119) and next prime (549131123).

It is not a de Polignac number, because 549131121 - 2¹ = 549131119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (549131123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 395506 + ... + 396891.

It is an arithmetic number, because the mean of its divisors is an integer number (41204696).

Almost surely, 2^549131121 is an apocalyptic number.

It is an amenable number.

549131121 is a deficient number, since it is larger than the sum of its proper divisors (439781583).

549131121 is a wasteful number, since it uses less digits than its factorization.

549131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792421 (or 792418 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 549131121 is about 23433.5469146265. The cubic root of 549131121 is about 818.8895940838.

The spelling of 549131121 in words is "five hundred forty-nine million, one hundred thirty-one thousand, one hundred twenty-one".