243685386025 has 9 divisors (see below), whose sum is σ = 302172939301. Its totient is φ = 194946334240.

The previous prime is 243685386023. The next prime is 243685386031. The reversal of 243685386025 is 520683586342.

The square root of 243685386025 is 493645.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 31271324569 + 212414061456 = 176837^2 + 460884^2 .

It is not a de Polignac number, because 243685386025 - 2¹ = 243685386023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243685386023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2418861 + ... + 2517589.

Almost surely, 2^243685386025 is an apocalyptic number.

243685386025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

243685386025 is the 493645-th square number.

243685386025 is the 246823-rd centered octagonal number.

It is an amenable number.

243685386025 is a deficient number, since it is larger than the sum of its proper divisors (58487553276).

243685386025 is an frugal number, since it uses more digits than its factorization.

243685386025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197468 (or 98734 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 52.

The spelling of 243685386025 in words is "two hundred forty-three billion, six hundred eighty-five million, three hundred eighty-six thousand, twenty-five".