1311787323 has 24 divisors (see below), whose sum is σ = 2362354176. Its totient is φ = 681447600.

The previous prime is 1311787291. The next prime is 1311787327. The reversal of 1311787323 is 3237871131.

It is not a de Polignac number, because 1311787323 - 2⁵ = 1311787291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311787327) 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, 945763 + ... + 947148.

It is an arithmetic number, because the mean of its divisors is an integer number (98431424).

Almost surely, 2^1311787323 is an apocalyptic number.

1311787323 is a deficient number, since it is larger than the sum of its proper divisors (1050566853).

1311787323 is a wasteful number, since it uses less digits than its factorization.

1311787323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892935 (or 1892932 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 1311787323 is about 36218.6046528576. The cubic root of 1311787323 is about 1094.6815787714.

The spelling of 1311787323 in words is "one billion, three hundred eleven million, seven hundred eighty-seven thousand, three hundred twenty-three".