1245649 has 2 divisors, whose sum is σ = 1245650. Its totient is φ = 1245648.

The previous prime is 1245623. The next prime is 1245683. The reversal of 1245649 is 9465421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1065024 + 180625 = 1032^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245649 - 2⁵ = 1245617 is a prime.

1245649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245649.

It is not a weakly prime, because it can be changed into another prime (1245619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622824 + 622825.

It is an arithmetic number, because the mean of its divisors is an integer number (622825).

2^1245649 is an apocalyptic number.

It is an amenable number.

1245649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245649 is an equidigital number, since it uses as much as digits as its factorization.

1245649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 1245649 is about 1116.0864661844. The cubic root of 1245649 is about 107.5966032657.

The spelling of 1245649 in words is "one million, two hundred forty-five thousand, six hundred forty-nine".