1311403121 has 24 divisors (see below), whose sum is σ = 1628915904. Its totient is φ = 1050144480.

The previous prime is 1311403111. The next prime is 1311403147. The reversal of 1311403121 is 1213041131.

It is not a de Polignac number, because 1311403121 - 2⁶ = 1311403057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311403121.

It is not an unprimeable number, because it can be changed into a prime (1311403111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34931 + ... + 61991.

It is an arithmetic number, because the mean of its divisors is an integer number (67871496).

Almost surely, 2^1311403121 is an apocalyptic number.

It is an amenable number.

1311403121 is a deficient number, since it is larger than the sum of its proper divisors (317512783).

1311403121 is a wasteful number, since it uses less digits than its factorization.

1311403121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27141 (or 27134 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1311403121 is about 36213.3003328887. The cubic root of 1311403121 is about 1094.5746966289.

Adding to 1311403121 its reverse (1213041131), we get a palindrome (2524444252).

The spelling of 1311403121 in words is "one billion, three hundred eleven million, four hundred three thousand, one hundred twenty-one".