243155525 has 6 divisors (see below), whose sum is σ = 301512882. Its totient is φ = 194524400.

The previous prime is 243155509. The next prime is 243155551. The reversal of 243155525 is 525551342.

243155525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 29235649 + 213919876 = 5407^2 + 14626^2 .

It is not a de Polignac number, because 243155525 - 2⁴ = 243155509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243155491 and 243155500.

It is a congruent number.

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, 4863086 + ... + 4863135.

It is an arithmetic number, because the mean of its divisors is an integer number (50252147).

Almost surely, 2^243155525 is an apocalyptic number.

243155525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243155525 is a deficient number, since it is larger than the sum of its proper divisors (58357357).

243155525 is an equidigital number, since it uses as much as digits as its factorization.

243155525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9726231 (or 9726226 counting only the distinct ones).

The product of its digits is 30000, while the sum is 32.

The square root of 243155525 is about 15593.4449368958. Note that the first 3 decimals coincide. The cubic root of 243155525 is about 624.1582481684.

The spelling of 243155525 in words is "two hundred forty-three million, one hundred fifty-five thousand, five hundred twenty-five".