1317385923 has 12 divisors (see below), whose sum is σ = 2043292680. Its totient is φ = 752791872.

The previous prime is 1317385907. The next prime is 1317385939. The reversal of 1317385923 is 3295837131.

1317385923 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1317385907) and next prime (1317385939).

It is not a de Polignac number, because 1317385923 - 2⁴ = 1317385907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1317385943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4480758 + ... + 4481051.

It is an arithmetic number, because the mean of its divisors is an integer number (170274390).

Almost surely, 2^1317385923 is an apocalyptic number.

1317385923 is a deficient number, since it is larger than the sum of its proper divisors (725906757).

1317385923 is an equidigital number, since it uses as much as digits as its factorization.

1317385923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8961826 (or 8961819 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 1317385923 is about 36295.8113699088. The cubic root of 1317385923 is about 1096.2367053502.

The spelling of 1317385923 in words is "one billion, three hundred seventeen million, three hundred eighty-five thousand, nine hundred twenty-three".