1312548691 has 4 divisors (see below), whose sum is σ = 1320408432. Its totient is φ = 1304688952.

The previous prime is 1312548571. The next prime is 1312548697. The reversal of 1312548691 is 1968452131.

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

It is a cyclic number.

It is not a de Polignac number, because 1312548691 - 2²¹ = 1310451539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312548697) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3929620 + ... + 3929953.

It is an arithmetic number, because the mean of its divisors is an integer number (330102108).

Almost surely, 2^1312548691 is an apocalyptic number.

1312548691 is a deficient number, since it is larger than the sum of its proper divisors (7859741).

1312548691 is an equidigital number, since it uses as much as digits as its factorization.

1312548691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7859740.

The product of its digits is 51840, while the sum is 40.

The square root of 1312548691 is about 36229.1138588843. The cubic root of 1312548691 is about 1094.8933240532.

It can be divided in two parts, 13125 and 48691, that added together give a palindrome (61816).

The spelling of 1312548691 in words is "one billion, three hundred twelve million, five hundred forty-eight thousand, six hundred ninety-one".