2113520861 has 2 divisors, whose sum is σ = 2113520862. Its totient is φ = 2113520860.

The previous prime is 2113520837. The next prime is 2113520867. The reversal of 2113520861 is 1680253112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1617567961 + 495952900 = 40219^2 + 22270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2113520861 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2113520867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056760430 + 1056760431.

It is an arithmetic number, because the mean of its divisors is an integer number (1056760431).

Almost surely, 2^2113520861 is an apocalyptic number.

It is an amenable number.

2113520861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113520861 is an equidigital number, since it uses as much as digits as its factorization.

2113520861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2113520861 is about 45973.0449393990. The cubic root of 2113520861 is about 1283.3216261521.

Adding to 2113520861 its reverse (1680253112), we get a palindrome (3793773973).

The spelling of 2113520861 in words is "two billion, one hundred thirteen million, five hundred twenty thousand, eight hundred sixty-one".