1318220685 has 24 divisors (see below), whose sum is σ = 2338056864. Its totient is φ = 686700000.

The previous prime is 1318220671. The next prime is 1318220699. The reversal of 1318220685 is 5860228131.

It is a happy number.

1318220685 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 (1318220671) and next prime (1318220699).

It is not a de Polignac number, because 1318220685 - 2⁶ = 1318220621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 338691 + ... + 342560.

It is an arithmetic number, because the mean of its divisors is an integer number (97419036).

Almost surely, 2^1318220685 is an apocalyptic number.

1318220685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1318220685 is a deficient number, since it is larger than the sum of its proper divisors (1019836179).

1318220685 is a wasteful number, since it uses less digits than its factorization.

1318220685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681305 (or 681302 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1318220685 is about 36307.3089749158. The cubic root of 1318220685 is about 1096.4682000380.

The spelling of 1318220685 in words is "one billion, three hundred eighteen million, two hundred twenty thousand, six hundred eighty-five".