2011644517 has 2 divisors, whose sum is σ = 2011644518. Its totient is φ = 2011644516.

The previous prime is 2011644511. The next prime is 2011644553. The reversal of 2011644517 is 7154461102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1971271201 + 40373316 = 44399^2 + 6354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011644517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011644511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005822258 + 1005822259.

It is an arithmetic number, because the mean of its divisors is an integer number (1005822259).

Almost surely, 2^2011644517 is an apocalyptic number.

It is an amenable number.

2011644517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011644517 is an equidigital number, since it uses as much as digits as its factorization.

2011644517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 2011644517 is about 44851.3602580791. The cubic root of 2011644517 is about 1262.3615150129.

The spelling of 2011644517 in words is "two billion, eleven million, six hundred forty-four thousand, five hundred seventeen".