1312211505 has 16 divisors (see below), whose sum is σ = 2290405824. Its totient is φ = 636223680.

The previous prime is 1312211477. The next prime is 1312211531. The reversal of 1312211505 is 5051122131.

It is not a de Polignac number, because 1312211505 - 2¹² = 1312207409 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, 3976234 + ... + 3976563.

It is an arithmetic number, because the mean of its divisors is an integer number (143150364).

Almost surely, 2^1312211505 is an apocalyptic number.

1312211505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1312211505 is a deficient number, since it is larger than the sum of its proper divisors (978194319).

1312211505 is a wasteful number, since it uses less digits than its factorization.

1312211505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7952816.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1312211505 is about 36224.4600373836. The cubic root of 1312211505 is about 1094.7995588159.

Adding to 1312211505 its reverse (5051122131), we get a palindrome (6363333636).

The spelling of 1312211505 in words is "one billion, three hundred twelve million, two hundred eleven thousand, five hundred five".