2125015649 has 2 divisors, whose sum is σ = 2125015650. Its totient is φ = 2125015648.

The previous prime is 2125015597. The next prime is 2125015663. The reversal of 2125015649 is 9465105212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2086662400 + 38353249 = 45680^2 + 6193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2125015649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2125015699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062507824 + 1062507825.

It is an arithmetic number, because the mean of its divisors is an integer number (1062507825).

Almost surely, 2^2125015649 is an apocalyptic number.

It is an amenable number.

2125015649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125015649 is an equidigital number, since it uses as much as digits as its factorization.

2125015649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 2125015649 is about 46097.8920233887. The cubic root of 2125015649 is about 1285.6439512418.

The spelling of 2125015649 in words is "two billion, one hundred twenty-five million, fifteen thousand, six hundred forty-nine".