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BaseRepresentation
bin100010100010…
…1011111011111
31021002002211201
41011011133133
514114013211
61444100331
7306636043
oct105053737
937062751
1018110431
11a24a6a9
1260946a7
1339a1341
142596023
1518cb0c1
hex11457df

18110431 has 2 divisors, whose sum is σ = 18110432. Its totient is φ = 18110430.

The previous prime is 18110399. The next prime is 18110447. The reversal of 18110431 is 13401181.

It is a strong prime.

It is an emirp because it is prime and its reverse (13401181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18110431 - 25 = 18110399 is a prime.

It is a super-2 number, since 2×181104312 = 655975422011522, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 18110399 and 18110408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18110461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9055215 + 9055216.

It is an arithmetic number, because the mean of its divisors is an integer number (9055216).

Almost surely, 218110431 is an apocalyptic number.

18110431 is the 2692-nd centered pentagonal number.

18110431 is a deficient number, since it is larger than the sum of its proper divisors (1).

18110431 is an equidigital number, since it uses as much as digits as its factorization.

18110431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 18110431 is about 4255.6352052308. The cubic root of 18110431 is about 262.6089935892.

The spelling of 18110431 in words is "eighteen million, one hundred ten thousand, four hundred thirty-one".