1318861 has 2 divisors, whose sum is σ = 1318862. Its totient is φ = 1318860.

The previous prime is 1318859. The next prime is 1318879. The reversal of 1318861 is 1688131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 837225 + 481636 = 915^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318861 - 2¹ = 1318859 is a prime.

Together with 1318859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659430 + 659431.

It is an arithmetic number, because the mean of its divisors is an integer number (659431).

2^1318861 is an apocalyptic number.

It is an amenable number.

1318861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318861 is an equidigital number, since it uses as much as digits as its factorization.

1318861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 28.

The square root of 1318861 is about 1148.4167362069. The cubic root of 1318861 is about 109.6645704811.

The spelling of 1318861 in words is "one million, three hundred eighteen thousand, eight hundred sixty-one".