18313117 has 2 divisors, whose sum is σ = 18313118. Its totient is φ = 18313116.

The previous prime is 18313103. The next prime is 18313121. The reversal of 18313117 is 71131381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9897316 + 8415801 = 3146^2 + 2901^2 .

It is a cyclic number.

It is not a de Polignac number, because 18313117 - 2⁷ = 18312989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18313091 and 18313100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18313517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156558 + 9156559.

It is an arithmetic number, because the mean of its divisors is an integer number (9156559).

Almost surely, 2^18313117 is an apocalyptic number.

It is an amenable number.

18313117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18313117 is an equidigital number, since it uses as much as digits as its factorization.

18313117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 25.

The square root of 18313117 is about 4279.3827825984. The cubic root of 18313117 is about 263.5850392901.

Adding to 18313117 its reverse (71131381), we get a palindrome (89444498).

The spelling of 18313117 in words is "eighteen million, three hundred thirteen thousand, one hundred seventeen".