1216713225 has 144 divisors (see below), whose sum is σ = 2595861632. Its totient is φ = 489646080.

The previous prime is 1216713193. The next prime is 1216713247. The reversal of 1216713225 is 5223176121.

It is not a de Polignac number, because 1216713225 - 2⁵ = 1216713193 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1216713192 and 1216713201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3610257 + ... + 3610593.

Almost surely, 2^1216713225 is an apocalyptic number.

1216713225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216713225 is an abundant number, since it is smaller than the sum of its proper divisors (1379148407).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216713225 is a wasteful number, since it uses less digits than its factorization.

1216713225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 388 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 1216713225 is about 34881.4166140081. The cubic root of 1216713225 is about 1067.5692997076.

Adding to 1216713225 its reverse (5223176121), we get a palindrome (6439889346).

The spelling of 1216713225 in words is "one billion, two hundred sixteen million, seven hundred thirteen thousand, two hundred twenty-five".