1311021315 has 16 divisors (see below), whose sum is σ = 2330704800. Its totient is φ = 699211296.

The previous prime is 1311021293. The next prime is 1311021323. The reversal of 1311021315 is 5131201131.

It is not a de Polignac number, because 1311021315 - 2¹² = 1311017219 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, 4855500 + ... + 4855769.

It is an arithmetic number, because the mean of its divisors is an integer number (145669050).

Almost surely, 2^1311021315 is an apocalyptic number.

1311021315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1311021315 is a deficient number, since it is larger than the sum of its proper divisors (1019683485).

1311021315 is an equidigital number, since it uses as much as digits as its factorization.

1311021315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9711283 (or 9711277 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1311021315 is about 36208.0283224591. The cubic root of 1311021315 is about 1094.4684603531.

Adding to 1311021315 its reverse (5131201131), we get a palindrome (6442222446).

The spelling of 1311021315 in words is "one billion, three hundred eleven million, twenty-one thousand, three hundred fifteen".