1216935225 has 192 divisors, whose sum is σ = 2674114560. Its totient is φ = 535680000.

The previous prime is 1216935169. The next prime is 1216935229. The reversal of 1216935225 is 5225396121.

It is a happy number.

1216935225 is a `hidden beast` number, since 121 + 6 + 9 + 3 + 522 + 5 = 666.

It is not a de Polignac number, because 1216935225 - 2⁹ = 1216934713 is a prime.

Together with 1457179335 it forms an amicable pair .

It is a self number, because there is not a number n which added to its sum of digits gives 1216935225.

It is not an unprimeable number, because it can be changed into a prime (1216935229) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3912820 + ... + 3913130.

It is an arithmetic number, because the mean of its divisors is an integer number (13927680).

Almost surely, 2^1216935225 is an apocalyptic number.

1216935225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216935225 is an abundant number, since it is smaller than the sum of its proper divisors (1457179335).

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

1216935225 is a wasteful number, since it uses less digits than its factorization.

1216935225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 378 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 1216935225 is about 34884.5986790733. The cubic root of 1216935225 is about 1067.6342248866.

The spelling of 1216935225 in words is "one billion, two hundred sixteen million, nine hundred thirty-five thousand, two hundred twenty-five".