1312562500 has 42 divisors (see below), whose sum is σ = 2871330434. Its totient is φ = 525000000.

The previous prime is 1312562497. The next prime is 1312562507. The reversal of 1312562500 is 52652131.

It can be written as a sum of positive squares in 7 ways, for example, as 1268499456 + 44063044 = 35616^2 + 6638^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1312562507) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 52000 + ... + 73000.

Almost surely, 2^1312562500 is an apocalyptic number.

1312562500 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 1312562500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1435665217).

1312562500 is an abundant number, since it is smaller than the sum of its proper divisors (1558767934).

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

1312562500 is an frugal number, since it uses more digits than its factorization.

1312562500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21035 (or 21008 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1312562500 is about 36229.3044371542. The cubic root of 1312562500 is about 1094.8971637403.

It can be divided in two parts, 13125 and 62500, that added together give a square (75625 = 275²).

The spelling of 1312562500 in words is "one billion, three hundred twelve million, five hundred sixty-two thousand, five hundred".