1255613649 has 16 divisors (see below), whose sum is σ = 1692748800. Its totient is φ = 827804880.

The previous prime is 1255613627. The next prime is 1255613657. The reversal of 1255613649 is 9463165521.

It is not a de Polignac number, because 1255613649 - 2⁸ = 1255613393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255613649.

It is not an unprimeable number, because it can be changed into a prime (1255613699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199452 + ... + 205650.

It is an arithmetic number, because the mean of its divisors is an integer number (105796800).

Almost surely, 2^1255613649 is an apocalyptic number.

It is an amenable number.

1255613649 is a deficient number, since it is larger than the sum of its proper divisors (437135151).

1255613649 is a wasteful number, since it uses less digits than its factorization.

1255613649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940.

The product of its digits is 194400, while the sum is 42.

The square root of 1255613649 is about 35434.6391120327. The cubic root of 1255613649 is about 1078.8275024062.

The spelling of 1255613649 in words is "one billion, two hundred fifty-five million, six hundred thirteen thousand, six hundred forty-nine".