1312522538 has 4 divisors (see below), whose sum is σ = 1968783810. Its totient is φ = 656261268.

The previous prime is 1312522529. The next prime is 1312522559. The reversal of 1312522538 is 8352252131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1154844289 + 157678249 = 33983^2 + 12557^2 .

It is a super-2 number, since 2×1312522538² = 3445430825515922888, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328130633 + ... + 328130636.

Almost surely, 2^1312522538 is an apocalyptic number.

1312522538 is a deficient number, since it is larger than the sum of its proper divisors (656261272).

1312522538 is an equidigital number, since it uses as much as digits as its factorization.

1312522538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656261271.

The product of its digits is 14400, while the sum is 32.

The square root of 1312522538 is about 36228.7529180898. The cubic root of 1312522538 is about 1094.8860519585.

Adding to 1312522538 its reverse (8352252131), we get a palindrome (9664774669).

The spelling of 1312522538 in words is "one billion, three hundred twelve million, five hundred twenty-two thousand, five hundred thirty-eight".