2168285381 has 2 divisors, whose sum is σ = 2168285382. Its totient is φ = 2168285380.

The previous prime is 2168285333. The next prime is 2168285447. The reversal of 2168285381 is 1835828612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1487336356 + 680949025 = 38566^2 + 26095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168285381 is a prime.

It is a super-2 number, since 2×2168285381² = 9402922986916630322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2168275381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084142690 + 1084142691.

It is an arithmetic number, because the mean of its divisors is an integer number (1084142691).

Almost surely, 2^2168285381 is an apocalyptic number.

It is an amenable number.

2168285381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168285381 is an equidigital number, since it uses as much as digits as its factorization.

2168285381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 184320, while the sum is 44.

The square root of 2168285381 is about 46564.8513473414. The cubic root of 2168285381 is about 1294.3115119084.

The spelling of 2168285381 in words is "two billion, one hundred sixty-eight million, two hundred eighty-five thousand, three hundred eighty-one".