2125649 has 2 divisors, whose sum is σ = 2125650. Its totient is φ = 2125648.

The previous prime is 2125621. The next prime is 2125657. The reversal of 2125649 is 9465212.

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., 1960000 + 165649 = 1400^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 2125649 - 2⁸ = 2125393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2125679) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062824 + 1062825.

It is an arithmetic number, because the mean of its divisors is an integer number (1062825).

2^2125649 is an apocalyptic number.

It is an amenable number.

2125649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125649 is an equidigital number, since it uses as much as digits as its factorization.

2125649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 2125649 is about 1457.9605618809. The cubic root of 2125649 is about 128.5771665282.

The spelling of 2125649 in words is "two million, one hundred twenty-five thousand, six hundred forty-nine".