1312685500 has 144 divisors (see below), whose sum is σ = 3368645280. Its totient is φ = 445536000.

The previous prime is 1312685497. The next prime is 1312685531. The reversal of 1312685500 is 55862131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3209296 + ... + 3209704.

It is an arithmetic number, because the mean of its divisors is an integer number (23393370).

Almost surely, 2^1312685500 is an apocalyptic number.

1312685500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312685500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1684322640).

1312685500 is an abundant number, since it is smaller than the sum of its proper divisors (2055959780).

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

1312685500 is a wasteful number, since it uses less digits than its factorization.

1312685500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1312685500 is about 36231.0019182468. The cubic root of 1312685500 is about 1094.9313635453.

The spelling of 1312685500 in words is "one billion, three hundred twelve million, six hundred eighty-five thousand, five hundred".