217982025 has 18 divisors (see below), whose sum is σ = 390430430. Its totient is φ = 116256960.

The previous prime is 217981993. The next prime is 217982029. The reversal of 217982025 is 520289712.

217982025 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 47444544 + 170537481 = 6888^2 + 13059^2 .

It is not a de Polignac number, because 217982025 - 2⁵ = 217981993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (217982029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 484180 + ... + 484629.

Almost surely, 2^217982025 is an apocalyptic number.

217982025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

217982025 is a deficient number, since it is larger than the sum of its proper divisors (172448405).

217982025 is a wasteful number, since it uses less digits than its factorization.

217982025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968825 (or 968817 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 217982025 is about 14764.2143373767. The cubic root of 217982025 is about 601.8296234590.

The spelling of 217982025 in words is "two hundred seventeen million, nine hundred eighty-two thousand, twenty-five".