1311267215 has 4 divisors (see below), whose sum is σ = 1573520664. Its totient is φ = 1049013768.

The previous prime is 1311267187. The next prime is 1311267257. The reversal of 1311267215 is 5127621131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5127621131 = 557 ⋅9205783.

It is a cyclic number.

It is not a de Polignac number, because 1311267215 - 2¹⁸ = 1311005071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131126717 + ... + 131126726.

It is an arithmetic number, because the mean of its divisors is an integer number (393380166).

Almost surely, 2^1311267215 is an apocalyptic number.

1311267215 is a deficient number, since it is larger than the sum of its proper divisors (262253449).

1311267215 is an equidigital number, since it uses as much as digits as its factorization.

1311267215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262253448.

The product of its digits is 2520, while the sum is 29.

The square root of 1311267215 is about 36211.4238190105. The cubic root of 1311267215 is about 1094.5368835910.

Adding to 1311267215 its reverse (5127621131), we get a palindrome (6438888346).

The spelling of 1311267215 in words is "one billion, three hundred eleven million, two hundred sixty-seven thousand, two hundred fifteen".