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5551111 is a prime number
BaseRepresentation
bin10101001011010000000111
3101110000200201
4111023100013
52410113421
6314551331
765116666
oct25132007
911400621
105551111
1131516a5
121a38547
1311c48a7
14a46ddd
15749b91
hex54b407

5551111 has 2 divisors, whose sum is σ = 5551112. Its totient is φ = 5551110.

The previous prime is 5551109. The next prime is 5551121. The reversal of 5551111 is 1111555.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5551111 - 21 = 5551109 is a prime.

Together with 5551109, it forms a pair of twin primes.

5551111 is a modest number, since divided by 1111 gives 555 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5551121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2775555 + 2775556.

It is an arithmetic number, because the mean of its divisors is an integer number (2775556).

Almost surely, 25551111 is an apocalyptic number.

5551111 is a deficient number, since it is larger than the sum of its proper divisors (1).

5551111 is an equidigital number, since it uses as much as digits as its factorization.

5551111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125, while the sum is 19.

The square root of 5551111 is about 2356.0795826966. The cubic root of 5551111 is about 177.0625184793.

Adding to 5551111 its reverse (1111555), we get a palindrome (6662666).

It can be divided in two parts, 555 and 1111, that multiplied together give a triangular number (616605 = T1110).

The spelling of 5551111 in words is "five million, five hundred fifty-one thousand, one hundred eleven".