1217108025 has 72 divisors (see below), whose sum is σ = 2583765184. Its totient is φ = 556372800.

The previous prime is 1217108021. The next prime is 1217108027. The reversal of 1217108025 is 5208017121.

It is not a de Polignac number, because 1217108025 - 2² = 1217108021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1217108025.

It is not an unprimeable number, because it can be changed into a prime (1217108021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28215 + ... + 56835.

Almost surely, 2^1217108025 is an apocalyptic number.

1217108025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1217108025 is an abundant number, since it is smaller than the sum of its proper divisors (1366657159).

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

1217108025 is an equidigital number, since it uses as much as digits as its factorization.

1217108025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28653 (or 28636 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 1217108025 is about 34887.0753288378. The cubic root of 1217108025 is about 1067.6847557773.

The spelling of 1217108025 in words is "one billion, two hundred seventeen million, one hundred eight thousand, twenty-five".