1312321525 has 12 divisors (see below), whose sum is σ = 1628653572. Its totient is φ = 1048970240.

The previous prime is 1312321457. The next prime is 1312321559. The reversal of 1312321525 is 5251232131.

It can be written as a sum of positive squares in 6 ways, for example, as 175350564 + 1136970961 = 13242^2 + 33719^2 .

It is not a de Polignac number, because 1312321525 - 2²¹ = 1310224373 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312321525.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8859 + ... + 51991.

It is an arithmetic number, because the mean of its divisors is an integer number (135721131).

Almost surely, 2^1312321525 is an apocalyptic number.

It is an amenable number.

1312321525 is a deficient number, since it is larger than the sum of its proper divisors (316332047).

1312321525 is a wasteful number, since it uses less digits than its factorization.

1312321525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44360 (or 44355 counting only the distinct ones).

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

The square root of 1312321525 is about 36225.9785927171. The cubic root of 1312321525 is about 1094.8301551237.

Adding to 1312321525 its reverse (5251232131), we get a palindrome (6563553656).

The spelling of 1312321525 in words is "one billion, three hundred twelve million, three hundred twenty-one thousand, five hundred twenty-five".