1311938743 has 16 divisors (see below), whose sum is σ = 1369728000. Its totient is φ = 1255050720.

The previous prime is 1311938723. The next prime is 1311938759. The reversal of 1311938743 is 3478391131.

It is a cyclic number.

It is not a de Polignac number, because 1311938743 - 2²⁵ = 1278384311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311938696 and 1311938705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311938723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2671728 + ... + 2672218.

It is an arithmetic number, because the mean of its divisors is an integer number (85608000).

Almost surely, 2^1311938743 is an apocalyptic number.

1311938743 is a deficient number, since it is larger than the sum of its proper divisors (57789257).

1311938743 is a wasteful number, since it uses less digits than its factorization.

1311938743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182.

The product of its digits is 54432, while the sum is 40.

The square root of 1311938743 is about 36220.6949546803. The cubic root of 1311938743 is about 1094.7236969574.

The spelling of 1311938743 in words is "one billion, three hundred eleven million, nine hundred thirty-eight thousand, seven hundred forty-three".