2130105581 has 2 divisors, whose sum is σ = 2130105582. Its totient is φ = 2130105580.

The previous prime is 2130105553. The next prime is 2130105583. The reversal of 2130105581 is 1855010312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2127976900 + 2128681 = 46130^2 + 1459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2130105581 is a prime.

It is a super-2 number, since 2×2130105581² = 9074699572414695122, which contains 22 as substring.

Together with 2130105583, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2130105581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2130105583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065052790 + 1065052791.

It is an arithmetic number, because the mean of its divisors is an integer number (1065052791).

Almost surely, 2^2130105581 is an apocalyptic number.

It is an amenable number.

2130105581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130105581 is an equidigital number, since it uses as much as digits as its factorization.

2130105581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 2130105581 is about 46153.0668645107. The cubic root of 2130105581 is about 1286.6696099679.

Adding to 2130105581 its reverse (1855010312), we get a palindrome (3985115893).

The spelling of 2130105581 in words is "two billion, one hundred thirty million, one hundred five thousand, five hundred eighty-one".