18513113 has 2 divisors, whose sum is σ = 18513114. Its totient is φ = 18513112.

The previous prime is 18513043. The next prime is 18513127. The reversal of 18513113 is 31131581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18088009 + 425104 = 4253^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 18513113 - 2¹⁴ = 18496729 is a prime.

It is a Chen prime.

It is equal to p_1181921 and since 18513113 and 1181921 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18513133) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256556 + 9256557.

It is an arithmetic number, because the mean of its divisors is an integer number (9256557).

Almost surely, 2^18513113 is an apocalyptic number.

It is an amenable number.

18513113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18513113 is an equidigital number, since it uses as much as digits as its factorization.

18513113 is an evil number, because the sum of its binary digits is even.

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

The square root of 18513113 is about 4302.6867187840. The cubic root of 18513113 is about 264.5410973122.

Adding to 18513113 its reverse (31131581), we get a palindrome (49644694).

The spelling of 18513113 in words is "eighteen million, five hundred thirteen thousand, one hundred thirteen".