1312511505 has 16 divisors (see below), whose sum is σ = 2102272704. Its totient is φ = 699254720.

The previous prime is 1312511477. The next prime is 1312511521. The reversal of 1312511505 is 5051152131.

It is not a de Polignac number, because 1312511505 - 2¹² = 1312507409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32379 + ... + 60608.

It is an arithmetic number, because the mean of its divisors is an integer number (131392044).

Almost surely, 2^1312511505 is an apocalyptic number.

1312511505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1312511505 is a deficient number, since it is larger than the sum of its proper divisors (789761199).

1312511505 is an equidigital number, since it uses as much as digits as its factorization.

1312511505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93936.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 1312511505 is about 36228.6006492108. The cubic root of 1312511505 is about 1094.8829840971.

Adding to 1312511505 its reverse (5051152131), we get a palindrome (6363663636).

The spelling of 1312511505 in words is "one billion, three hundred twelve million, five hundred eleven thousand, five hundred five".