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18643813 is a prime number
BaseRepresentation
bin100011100011…
…1101101100101
31022002012111121
41013013231211
514233100223
61503333541
7314320066
oct107075545
938065447
1018643813
11a584411
1262b12b1
133b2a056
14269456d
15198415d
hex11c7b65

18643813 has 2 divisors, whose sum is σ = 18643814. Its totient is φ = 18643812.

The previous prime is 18643799. The next prime is 18643817. The reversal of 18643813 is 31834681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11847364 + 6796449 = 3442^2 + 2607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-18643813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18643817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9321906 + 9321907.

It is an arithmetic number, because the mean of its divisors is an integer number (9321907).

Almost surely, 218643813 is an apocalyptic number.

It is an amenable number.

18643813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18643813 is an equidigital number, since it uses as much as digits as its factorization.

18643813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 18643813 is about 4317.8481909396. The cubic root of 18643813 is about 265.1621791176.

The spelling of 18643813 in words is "eighteen million, six hundred forty-three thousand, eight hundred thirteen".