2101605461 has 2 divisors, whose sum is σ = 2101605462. Its totient is φ = 2101605460.

The previous prime is 2101605397. The next prime is 2101605469. The reversal of 2101605461 is 1645061012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2089038436 + 12567025 = 45706^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101605461 - 2⁶ = 2101605397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101605461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101605469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050802730 + 1050802731.

It is an arithmetic number, because the mean of its divisors is an integer number (1050802731).

Almost surely, 2^2101605461 is an apocalyptic number.

It is an amenable number.

2101605461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101605461 is an equidigital number, since it uses as much as digits as its factorization.

2101605461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2101605461 is about 45843.2706184888. The cubic root of 2101605461 is about 1280.9054183540.

Adding to 2101605461 its reverse (1645061012), we get a palindrome (3746666473).

The spelling of 2101605461 in words is "two billion, one hundred one million, six hundred five thousand, four hundred sixty-one".