243942149025 has 81 divisors (see below), whose sum is σ = 461400246489. Its totient is φ = 123183858240.

The previous prime is 243942148973. The next prime is 243942149041. The reversal of 243942149025 is 520941249342.

The square root of 243942149025 is 493905.

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

243942149025 is a `hidden beast` number, since 24 + 394 + 214 + 9 + 0 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9422779041 + 234519369984 = 97071^2 + 484272^2 .

It is not a de Polignac number, because 243942149025 - 2¹⁷ = 243942017953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 140762059 + ... + 140763791.

Almost surely, 2^243942149025 is an apocalyptic number.

243942149025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

243942149025 is the 493905-th square number.

243942149025 is the 246953-rd centered octagonal number.

It is an amenable number.

243942149025 is a deficient number, since it is larger than the sum of its proper divisors (217458097464).

243942149025 is an equidigital number, since it uses as much as digits as its factorization.

243942149025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520 (or 1760 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 243942149025 in words is "two hundred forty-three billion, nine hundred forty-two million, one hundred forty-nine thousand, twenty-five".