1253553649 has 2 divisors, whose sum is σ = 1253553650. Its totient is φ = 1253553648.

The previous prime is 1253553629. The next prime is 1253553677. The reversal of 1253553649 is 9463553521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243056049 + 10497600 = 35257^2 + 3240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253553649 - 2¹³ = 1253545457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1253553629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626776824 + 626776825.

It is an arithmetic number, because the mean of its divisors is an integer number (626776825).

Almost surely, 2^1253553649 is an apocalyptic number.

It is an amenable number.

1253553649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253553649 is an equidigital number, since it uses as much as digits as its factorization.

1253553649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 43.

The square root of 1253553649 is about 35405.5595775579. The cubic root of 1253553649 is about 1078.2371931346.

The spelling of 1253553649 in words is "one billion, two hundred fifty-three million, five hundred fifty-three thousand, six hundred forty-nine".