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128819 is a prime number
BaseRepresentation
bin11111011100110011
320112201002
4133130303
513110234
62432215
71044365
oct373463
9215632
10128819
1188869
126266b
1346832
1434d35
152827e
hex1f733

128819 has 2 divisors, whose sum is σ = 128820. Its totient is φ = 128818.

The previous prime is 128813. The next prime is 128831. The reversal of 128819 is 918821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128819 - 28 = 128563 is a prime.

It is a super-2 number, since 2×1288192 = 33188669522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 128791 and 128800.

It is not a weakly prime, because it can be changed into another prime (128813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64409 + 64410.

It is an arithmetic number, because the mean of its divisors is an integer number (64410).

2128819 is an apocalyptic number.

128819 is a deficient number, since it is larger than the sum of its proper divisors (1).

128819 is an equidigital number, since it uses as much as digits as its factorization.

128819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 29.

The square root of 128819 is about 358.9136386375. The cubic root of 128819 is about 50.5041005722.

The spelling of 128819 in words is "one hundred twenty-eight thousand, eight hundred nineteen".