243121131144 has 24 divisors (see below), whose sum is σ = 658453063710. Its totient is φ = 81040377024.

The previous prime is 243121131101. The next prime is 243121131181. The reversal of 243121131144 is 441131121342.

It is a happy number.

243121131144 is a `hidden beast` number, since 2 + 431 + 2 + 113 + 114 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 231813360900 + 11307770244 = 481470^2 + 106338^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1688341117 + ... + 1688341260.

Almost surely, 2^243121131144 is an apocalyptic number.

243121131144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

243121131144 is an abundant number, since it is smaller than the sum of its proper divisors (415331932566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243121131144 is a wasteful number, since it uses less digits than its factorization.

243121131144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376682389 (or 3376682382 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 243121131144 its reverse (441131121342), we get a palindrome (684252252486).

The spelling of 243121131144 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred thirty-one thousand, one hundred forty-four".