243181025 has 6 divisors (see below), whose sum is σ = 301544502. Its totient is φ = 194544800.

The previous prime is 243180991. The next prime is 243181049. The reversal of 243181025 is 520181342.

It can be written as a sum of positive squares in 3 ways, for example, as 35331136 + 207849889 = 5944^2 + 14417^2 .

It is not a de Polignac number, because 243181025 - 2¹⁰ = 243180001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243180985 and 243181003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4863596 + ... + 4863645.

It is an arithmetic number, because the mean of its divisors is an integer number (50257417).

Almost surely, 2^243181025 is an apocalyptic number.

243181025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243181025 is a deficient number, since it is larger than the sum of its proper divisors (58363477).

243181025 is an equidigital number, since it uses as much as digits as its factorization.

243181025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9727251 (or 9727246 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 243181025 is about 15594.2625667263. The cubic root of 243181025 is about 624.1800661373.

The spelling of 243181025 in words is "two hundred forty-three million, one hundred eighty-one thousand, twenty-five".