918187513 has 2 divisors, whose sum is σ = 918187514. Its totient is φ = 918187512.

The previous prime is 918187511. The next prime is 918187519. The reversal of 918187513 is 315781819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717596944 + 200590569 = 26788^2 + 14163^2 .

It is an emirp because it is prime and its reverse (315781819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 918187513 - 2¹ = 918187511 is a prime.

Together with 918187511, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 918187513.

It is not a weakly prime, because it can be changed into another prime (918187511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459093756 + 459093757.

It is an arithmetic number, because the mean of its divisors is an integer number (459093757).

Almost surely, 2^918187513 is an apocalyptic number.

It is an amenable number.

918187513 is a deficient number, since it is larger than the sum of its proper divisors (1).

918187513 is an equidigital number, since it uses as much as digits as its factorization.

918187513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 43.

The square root of 918187513 is about 30301.6090826873. The cubic root of 918187513 is about 971.9497090076.

The spelling of 918187513 in words is "nine hundred eighteen million, one hundred eighty-seven thousand, five hundred thirteen".