2231216325 has 36 divisors (see below), whose sum is σ = 4303774020. Its totient is φ = 1098443520.

The previous prime is 2231216279. The next prime is 2231216329. The reversal of 2231216325 is 5236121322.

It is a happy number.

2231216325 is a `hidden beast` number, since 2 + 2 + 3 + 1 + 21 + 632 + 5 = 666.

2231216325 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 862068321 + 1369148004 = 29361^2 + 37002^2 .

It is not a de Polignac number, because 2231216325 - 2¹¹ = 2231214277 is a prime.

It is a super-3 number, since 3×2231216325³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231216329) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 378480 + ... + 384329.

Almost surely, 2^2231216325 is an apocalyptic number.

2231216325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2231216325 is a deficient number, since it is larger than the sum of its proper divisors (2072557695).

2231216325 is a wasteful number, since it uses less digits than its factorization.

2231216325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762838 (or 762830 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2231216325 is about 47235.7526138835. The cubic root of 2231216325 is about 1306.7140466458.

Adding to 2231216325 its reverse (5236121322), we get a palindrome (7467337647).

The spelling of 2231216325 in words is "two billion, two hundred thirty-one million, two hundred sixteen thousand, three hundred twenty-five".