2105132581 has 2 divisors, whose sum is σ = 2105132582. Its totient is φ = 2105132580.

The previous prime is 2105132539. The next prime is 2105132633. The reversal of 2105132581 is 1852315012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1160492356 + 944640225 = 34066^2 + 30735^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105132581 - 2⁷ = 2105132453 is a prime.

It is a super-2 number, since 2×2105132581² = 8863166367175443122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105135581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052566290 + 1052566291.

It is an arithmetic number, because the mean of its divisors is an integer number (1052566291).

Almost surely, 2^2105132581 is an apocalyptic number.

It is an amenable number.

2105132581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105132581 is an equidigital number, since it uses as much as digits as its factorization.

2105132581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 2105132581 is about 45881.7238233264. The cubic root of 2105132581 is about 1281.6215981337.

Adding to 2105132581 its reverse (1852315012), we get a palindrome (3957447593).

The spelling of 2105132581 in words is "two billion, one hundred five million, one hundred thirty-two thousand, five hundred eighty-one".