1265316500 has 96 divisors (see below), whose sum is σ = 3191645184. Its totient is φ = 429235200.

The previous prime is 1265316499. The next prime is 1265316509. The reversal of 1265316500 is 56135621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265316509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 337637 + ... + 341363.

It is an arithmetic number, because the mean of its divisors is an integer number (33246304).

Almost surely, 2^1265316500 is an apocalyptic number.

1265316500 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 1265316500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1595822592).

1265316500 is an abundant number, since it is smaller than the sum of its proper divisors (1926328684).

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

1265316500 is a wasteful number, since it uses less digits than its factorization.

1265316500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850 (or 3838 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1265316500 is about 35571.2875786076. The cubic root of 1265316500 is about 1081.5992823925.

The spelling of 1265316500 in words is "one billion, two hundred sixty-five million, three hundred sixteen thousand, five hundred".