216717025 has 12 divisors (see below), whose sum is σ = 307119232. Its totient is φ = 148605840.

The previous prime is 216717023. The next prime is 216717031. The reversal of 216717025 is 520717612.

It is not a de Polignac number, because 216717025 - 2¹ = 216717023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216717023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 619017 + ... + 619366.

Almost surely, 2^216717025 is an apocalyptic number.

216717025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216717025 is a deficient number, since it is larger than the sum of its proper divisors (90402207).

216717025 is a wasteful number, since it uses less digits than its factorization.

216717025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238400 (or 1238395 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 216717025 is about 14721.3119320256. The cubic root of 216717025 is about 600.6631787569.

The spelling of 216717025 in words is "two hundred sixteen million, seven hundred seventeen thousand, twenty-five".