243121250025 has 18 divisors (see below), whose sum is σ = 435457172670. Its totient is φ = 129664666560.

The previous prime is 243121250011. The next prime is 243121250033. The reversal of 243121250025 is 520052121342.

It can be written as a sum of positive squares in 3 ways, for example, as 65061725184 + 178059524841 = 255072^2 + 421971^2 .

It is not a de Polignac number, because 243121250025 - 2⁶ = 243121249961 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 540269220 + ... + 540269669.

Almost surely, 2^243121250025 is an apocalyptic number.

243121250025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243121250025 is a deficient number, since it is larger than the sum of its proper divisors (192335922645).

243121250025 is a wasteful number, since it uses less digits than its factorization.

243121250025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080538905 (or 1080538897 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 243121250025 its reverse (520052121342), we get a palindrome (763173371367).

The spelling of 243121250025 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred fifty thousand, twenty-five".