2749508561 has 2 divisors, whose sum is σ = 2749508562. Its totient is φ = 2749508560.

The previous prime is 2749508551. The next prime is 2749508569. The reversal of 2749508561 is 1658059472.

It is a happy number.

2749508561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1914587536 + 834921025 = 43756^2 + 28895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2749508561 - 2⁶ = 2749508497 is a prime.

It is not a weakly prime, because it can be changed into another prime (2749508569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1374754280 + 1374754281.

It is an arithmetic number, because the mean of its divisors is an integer number (1374754281).

Almost surely, 2^2749508561 is an apocalyptic number.

It is an amenable number.

2749508561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2749508561 is an equidigital number, since it uses as much as digits as its factorization.

2749508561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 47.

The square root of 2749508561 is about 52435.7565121359. The cubic root of 2749508561 is about 1400.9362039069.

The spelling of 2749508561 in words is "two billion, seven hundred forty-nine million, five hundred eight thousand, five hundred sixty-one".