318087091789 has 2 divisors, whose sum is σ = 318087091790. Its totient is φ = 318087091788.

The previous prime is 318087091787. The next prime is 318087091841. The reversal of 318087091789 is 987190780813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277739540100 + 40347551689 = 527010^2 + 200867^2 .

It is a cyclic number.

It is not a de Polignac number, because 318087091789 - 2¹ = 318087091787 is a prime.

It is a super-2 number, since 2×318087091789² (a number of 24 digits) contains 22 as substring.

Together with 318087091787, 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 (318087091781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159043545894 + 159043545895.

It is an arithmetic number, because the mean of its divisors is an integer number (159043545895).

Almost surely, 2^318087091789 is an apocalyptic number.

It is an amenable number.

318087091789 is a deficient number, since it is larger than the sum of its proper divisors (1).

318087091789 is an equidigital number, since it uses as much as digits as its factorization.

318087091789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 61.

The spelling of 318087091789 in words is "three hundred eighteen billion, eighty-seven million, ninety-one thousand, seven hundred eighty-nine".