243131555025 has 288 divisors, whose sum is σ = 482594112000. Its totient is φ = 116620922880.

The previous prime is 243131555021. The next prime is 243131555101. The reversal of 243131555025 is 520555131342.

243131555025 is a `hidden beast` number, since 2 + 431 + 3 + 155 + 50 + 25 = 666.

243131555025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243131555025 - 2² = 243131555021 is a prime.

It is a super-2 number, since 2×243131555025² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243131555021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1455877492 + ... + 1455877658.

It is an arithmetic number, because the mean of its divisors is an integer number (1675674000).

Almost surely, 2^243131555025 is an apocalyptic number.

243131555025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243131555025 is a deficient number, since it is larger than the sum of its proper divisors (239462556975).

243131555025 is a wasteful number, since it uses less digits than its factorization.

243131555025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Adding to 243131555025 its reverse (520555131342), we get a palindrome (763686686367).

The spelling of 243131555025 in words is "two hundred forty-three billion, one hundred thirty-one million, five hundred fifty-five thousand, twenty-five".