1312502136 has 128 divisors (see below), whose sum is σ = 3826310400. Its totient is φ = 370759680.

The previous prime is 1312502131. The next prime is 1312502137. The reversal of 1312502136 is 6312052131.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312502131) 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, 487851 + ... + 490533.

It is an arithmetic number, because the mean of its divisors is an integer number (29893050).

Almost surely, 2^1312502136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312502136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1913155200).

1312502136 is an abundant number, since it is smaller than the sum of its proper divisors (2513808264).

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

1312502136 is a wasteful number, since it uses less digits than its factorization.

1312502136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829 (or 2825 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1312502136 is about 36228.4713450623. The cubic root of 1312502136 is about 1094.8803789179.

Adding to 1312502136 its reverse (6312052131), we get a palindrome (7624554267).

It can be divided in two parts, 131250 and 2136, that added together give a triangular number (133386 = T₅₁₆).

The spelling of 1312502136 in words is "one billion, three hundred twelve million, five hundred two thousand, one hundred thirty-six".