43197821975025 has 81 divisors (see below), whose sum is σ = 79312672118433. Its totient is φ = 22474812297600.

The previous prime is 43197821975023. The next prime is 43197821975039. The reversal of 43197821975025 is 52057912879134.

It is a happy number.

The square root of 43197821975025 is 6572505.

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

43197821975025 is a `hidden beast` number, since 4 + 3 + 19 + 7 + 8 + 21 + 97 + 502 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18182659676769 + 25015162298256 = 4264113^2 + 5001516^2 .

It is not a de Polignac number, because 43197821975025 - 2¹ = 43197821975023 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43197821975023) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4042085232 + ... + 4042095918.

Almost surely, 2^{43197821975025} is an apocalyptic number.

43197821975025 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

43197821975025 is the 6572505-th square number.

43197821975025 is the 3286253-rd centered octagonal number.

It is an amenable number.

43197821975025 is a deficient number, since it is larger than the sum of its proper divisors (36114850143408).

43197821975025 is an frugal number, since it uses more digits than its factorization.

43197821975025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21472 (or 10736 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 63.

The spelling of 43197821975025 in words is "forty-three trillion, one hundred ninety-seven billion, eight hundred twenty-one million, nine hundred seventy-five thousand, twenty-five".