1312217250 has 128 divisors (see below), whose sum is σ = 3505731840. Its totient is φ = 325760000.

The previous prime is 1312217209. The next prime is 1312217251. The reversal of 1312217250 is 527122131.

It is a super-2 number, since 2×1312217250² = 3443828222395125000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1312217250.

It is not an unprimeable number, because it can be changed into a prime (1312217251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1287241 + ... + 1288259.

It is an arithmetic number, because the mean of its divisors is an integer number (27388530).

Almost surely, 2^1312217250 is an apocalyptic number.

1312217250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312217250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1752865920).

1312217250 is an abundant number, since it is smaller than the sum of its proper divisors (2193514590).

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

1312217250 is a wasteful number, since it uses less digits than its factorization.

1312217250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157 (or 1147 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1312217250 is about 36224.5393345450. The cubic root of 1312217250 is about 1094.8011565294.

Adding to 1312217250 its reverse (527122131), we get a palindrome (1839339381).

The spelling of 1312217250 in words is "one billion, three hundred twelve million, two hundred seventeen thousand, two hundred fifty".