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28916143 is a prime number
BaseRepresentation
bin110111001001…
…1100110101111
32000102002111021
41232103212233
524400304033
62511435011
7500532424
oct156234657
960362437
1028916143
1115360143
129825a67
135cb5859
143ba9d4b
152812b2d
hex1b939af

28916143 has 2 divisors, whose sum is σ = 28916144. Its totient is φ = 28916142.

The previous prime is 28916141. The next prime is 28916177. The reversal of 28916143 is 34161982.

It is an a-pointer prime, because the next prime (28916177) can be obtained adding 28916143 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28916143 - 21 = 28916141 is a prime.

It is a super-2 number, since 2×289161432 = 1672286651992898, which contains 22 as substring.

Together with 28916141, it forms a pair of twin primes.

It is equal to p1794805 and since 28916143 and 1794805 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 28916099 and 28916108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28916141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14458071 + 14458072.

It is an arithmetic number, because the mean of its divisors is an integer number (14458072).

Almost surely, 228916143 is an apocalyptic number.

28916143 is a deficient number, since it is larger than the sum of its proper divisors (1).

28916143 is an equidigital number, since it uses as much as digits as its factorization.

28916143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 28916143 is about 5377.3732435084. The cubic root of 28916143 is about 306.9352641783.

The spelling of 28916143 in words is "twenty-eight million, nine hundred sixteen thousand, one hundred forty-three".