228001381 has 2 divisors, whose sum is σ = 228001382. Its totient is φ = 228001380.

The previous prime is 228001379. The next prime is 228001409. The reversal of 228001381 is 183100822.

228001381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163456225 + 64545156 = 12785^2 + 8034^2 .

It is a cyclic number.

It is not a de Polignac number, because 228001381 - 2¹ = 228001379 is a prime.

It is a super-2 number, since 2×228001381² = 103969259475814322, which contains 22 as substring.

Together with 228001379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228001321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114000690 + 114000691.

It is an arithmetic number, because the mean of its divisors is an integer number (114000691).

Almost surely, 2^228001381 is an apocalyptic number.

It is an amenable number.

228001381 is a deficient number, since it is larger than the sum of its proper divisors (1).

228001381 is an equidigital number, since it uses as much as digits as its factorization.

228001381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 228001381 is about 15099.7145999519. The cubic root of 228001381 is about 610.9127078603.

The spelling of 228001381 in words is "two hundred twenty-eight million, one thousand, three hundred eighty-one".