Search a number
228380819 is a prime number
BaseRepresentation
bin11011001110011…
…01000010010011
3120220201221120212
431213031002103
5431431141234
634354554335
75442130202
oct1547150223
9526657525
10228380819
11107a07987
12645989ab
13384132a4
142248d239
15150b35ce
hexd9cd093

228380819 has 2 divisors, whose sum is σ = 228380820. Its totient is φ = 228380818.

The previous prime is 228380809. The next prime is 228380821. The reversal of 228380819 is 918083822.

It is a happy number.

228380819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-228380819 is a prime.

It is a super-2 number, since 2×2283808192 = 104315596974221522, which contains 22 as substring.

Together with 228380821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228380809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114190409 + 114190410.

It is an arithmetic number, because the mean of its divisors is an integer number (114190410).

Almost surely, 2228380819 is an apocalyptic number.

228380819 is a deficient number, since it is larger than the sum of its proper divisors (1).

228380819 is an equidigital number, since it uses as much as digits as its factorization.

228380819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 228380819 is about 15112.2737865617. The cubic root of 228380819 is about 611.2514119876.

The spelling of 228380819 in words is "two hundred twenty-eight million, three hundred eighty thousand, eight hundred nineteen".