1311212103 has 32 divisors (see below), whose sum is σ = 1835773632. Its totient is φ = 831667200.

The previous prime is 1311212101. The next prime is 1311212117. The reversal of 1311212103 is 3012121131.

It is a happy number.

It is not a de Polignac number, because 1311212103 - 2¹ = 1311212101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311212101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1283733 + ... + 1284753.

It is an arithmetic number, because the mean of its divisors is an integer number (57367926).

Almost surely, 2^1311212103 is an apocalyptic number.

1311212103 is a deficient number, since it is larger than the sum of its proper divisors (524561529).

1311212103 is a wasteful number, since it uses less digits than its factorization.

1311212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311212103 is about 36210.6628356897. The cubic root of 1311212103 is about 1094.5215490705.

Adding to 1311212103 its reverse (3012121131), we get a palindrome (4323333234).

The spelling of 1311212103 in words is "one billion, three hundred eleven million, two hundred twelve thousand, one hundred three".