18315113 has 2 divisors, whose sum is σ = 18315114. Its totient is φ = 18315112.

The previous prime is 18315091. The next prime is 18315127. The reversal of 18315113 is 31151381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9535744 + 8779369 = 3088^2 + 2963^2 .

It is an emirp because it is prime and its reverse (31151381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18315113 - 2⁶ = 18315049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18315133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9157556 + 9157557.

It is an arithmetic number, because the mean of its divisors is an integer number (9157557).

Almost surely, 2^18315113 is an apocalyptic number.

It is an amenable number.

18315113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18315113 is an equidigital number, since it uses as much as digits as its factorization.

18315113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 18315113 is about 4279.6159874456. The cubic root of 18315113 is about 263.5946152427.

Adding to 18315113 its reverse (31151381), we get a palindrome (49466494).

It can be divided in two parts, 18315 and 113, that multiplied together give a triangular number (2069595 = T₂₀₃₄).

The spelling of 18315113 in words is "eighteen million, three hundred fifteen thousand, one hundred thirteen".