2105945381 has 2 divisors, whose sum is σ = 2105945382. Its totient is φ = 2105945380.

The previous prime is 2105945371. The next prime is 2105945417. The reversal of 2105945381 is 1835495012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2009728900 + 96216481 = 44830^2 + 9809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105945381 is a prime.

It is a super-2 number, since 2×2105945381² = 8870011895510470322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105945311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052972690 + 1052972691.

It is an arithmetic number, because the mean of its divisors is an integer number (1052972691).

Almost surely, 2^2105945381 is an apocalyptic number.

It is an amenable number.

2105945381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105945381 is an equidigital number, since it uses as much as digits as its factorization.

2105945381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 2105945381 is about 45890.5805258552. The cubic root of 2105945381 is about 1281.7865232956.

The spelling of 2105945381 in words is "two billion, one hundred five million, nine hundred forty-five thousand, three hundred eighty-one".