207216025 has 9 divisors (see below), whose sum is σ = 257037151. Its totient is φ = 165715240.

The previous prime is 207216017. The next prime is 207216067. The reversal of 207216025 is 520612702.

The square root of 207216025 is 14395.

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

It can be written as a sum of positive squares in only one way, i.e., 74597769 + 132618256 = 8637^2 + 11516^2 .

It is not a de Polignac number, because 207216025 - 2³ = 207216017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 70536 + ... + 73414.

Almost surely, 2^207216025 is an apocalyptic number.

207216025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

207216025 is the 14395-th square number.

207216025 is the 7198-th centered octagonal number.

It is an amenable number.

207216025 is a deficient number, since it is larger than the sum of its proper divisors (49821126).

207216025 is an frugal number, since it uses more digits than its factorization.

207216025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5768 (or 2884 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The cubic root of 207216025 is about 591.7538781273.

Multiplying 207216025 by its sum of digits (25), we get a square (5180400625 = 71975²).

207216025 divided by its sum of digits (25) gives a square (8288641 = 2879²).

Adding to 207216025 its reverse (520612702), we get a palindrome (727828727).

The spelling of 207216025 in words is "two hundred seven million, two hundred sixteen thousand, twenty-five".