1256018225 has 72 divisors (see below), whose sum is σ = 2093089248. Its totient is φ = 736780800.

The previous prime is 1256018171. The next prime is 1256018249. The reversal of 1256018225 is 5228106521.

It is not a de Polignac number, because 1256018225 - 2¹⁴ = 1256001841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1256018191 and 1256018200.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 226334 + ... + 231816.

It is an arithmetic number, because the mean of its divisors is an integer number (29070684).

Almost surely, 2^1256018225 is an apocalyptic number.

It is an amenable number.

1256018225 is a deficient number, since it is larger than the sum of its proper divisors (837071023).

1256018225 is a wasteful number, since it uses less digits than its factorization.

1256018225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5535 (or 5523 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 1256018225 is about 35440.3474164687. The cubic root of 1256018225 is about 1078.9433609868.

The spelling of 1256018225 in words is "one billion, two hundred fifty-six million, eighteen thousand, two hundred twenty-five".