1318217823 has 48 divisors (see below), whose sum is σ = 2128482720. Its totient is φ = 780579072.

The previous prime is 1318217821. The next prime is 1318217843. The reversal of 1318217823 is 3287128131.

It is not a de Polignac number, because 1318217823 - 2¹ = 1318217821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318217821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1502661 + ... + 1503537.

It is an arithmetic number, because the mean of its divisors is an integer number (44343390).

Almost surely, 2^1318217823 is an apocalyptic number.

1318217823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1318217823 is a deficient number, since it is larger than the sum of its proper divisors (810264897).

1318217823 is a wasteful number, since it uses less digits than its factorization.

1318217823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1365 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 1318217823 is about 36307.2695613427. The cubic root of 1318217823 is about 1096.4674065204.

The spelling of 1318217823 in words is "one billion, three hundred eighteen million, two hundred seventeen thousand, eight hundred twenty-three".