18254813 has 2 divisors, whose sum is σ = 18254814. Its totient is φ = 18254812.

The previous prime is 18254809. The next prime is 18254827. The reversal of 18254813 is 31845281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18207289 + 47524 = 4267^2 + 218^2 .

It is a cyclic number.

It is not a de Polignac number, because 18254813 - 2² = 18254809 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 18254813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18254513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9127406 + 9127407.

It is an arithmetic number, because the mean of its divisors is an integer number (9127407).

Almost surely, 2^18254813 is an apocalyptic number.

It is an amenable number.

18254813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18254813 is an equidigital number, since it uses as much as digits as its factorization.

18254813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 32.

The square root of 18254813 is about 4272.5651545646. The cubic root of 18254813 is about 263.3050141349.

The spelling of 18254813 in words is "eighteen million, two hundred fifty-four thousand, eight hundred thirteen".