2101774309 has 2 divisors, whose sum is σ = 2101774310. Its totient is φ = 2101774308.

The previous prime is 2101774291. The next prime is 2101774313. The reversal of 2101774309 is 9034771012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1528028100 + 573746209 = 39090^2 + 23953^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101774309 - 2⁹ = 2101773797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101724309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050887154 + 1050887155.

It is an arithmetic number, because the mean of its divisors is an integer number (1050887155).

Almost surely, 2^2101774309 is an apocalyptic number.

It is an amenable number.

2101774309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101774309 is an equidigital number, since it uses as much as digits as its factorization.

2101774309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 2101774309 is about 45845.1121604038. The cubic root of 2101774309 is about 1280.9397211017.

The spelling of 2101774309 in words is "two billion, one hundred one million, seven hundred seventy-four thousand, three hundred nine".