243551121 has 16 divisors (see below), whose sum is σ = 354858240. Its totient is φ = 147355920.

The previous prime is 243551107. The next prime is 243551137. The reversal of 243551121 is 121155342.

It is a happy number.

It is not a de Polignac number, because 243551121 - 2⁵ = 243551089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243551091 and 243551100.

It is not an unprimeable number, because it can be changed into a prime (243551171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14466 + ... + 26388.

It is an arithmetic number, because the mean of its divisors is an integer number (22178640).

Almost surely, 2^243551121 is an apocalyptic number.

It is an amenable number.

243551121 is a deficient number, since it is larger than the sum of its proper divisors (111307119).

243551121 is a wasteful number, since it uses less digits than its factorization.

243551121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12556.

The product of its digits is 1200, while the sum is 24.

The square root of 243551121 is about 15606.1244708608. The cubic root of 243551121 is about 624.4965511584.

The spelling of 243551121 in words is "two hundred forty-three million, five hundred fifty-one thousand, one hundred twenty-one".