1312518220 has 36 divisors (see below), whose sum is σ = 2984627520. Its totient is φ = 484620864.

The previous prime is 1312518209. The next prime is 1312518223. The reversal of 1312518220 is 228152131.

It is not an unprimeable number, because it can be changed into a prime (1312518223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190780 + ... + 197539.

It is an arithmetic number, because the mean of its divisors is an integer number (82906320).

Almost surely, 2^1312518220 is an apocalyptic number.

1312518220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312518220 is an abundant number, since it is smaller than the sum of its proper divisors (1672109300).

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

1312518220 is a wasteful number, since it uses less digits than its factorization.

1312518220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388354 (or 388339 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1312518220 is about 36228.6933244907. The cubic root of 1312518220 is about 1094.8848512875.

The spelling of 1312518220 in words is "one billion, three hundred twelve million, five hundred eighteen thousand, two hundred twenty".