1256065427 has 4 divisors (see below), whose sum is σ = 1259624040. Its totient is φ = 1252506816.

The previous prime is 1256065411. The next prime is 1256065453. The reversal of 1256065427 is 7245606521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1256065427 - 2⁴ = 1256065411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256064427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1778777 + ... + 1779482.

It is an arithmetic number, because the mean of its divisors is an integer number (314906010).

Almost surely, 2^1256065427 is an apocalyptic number.

1256065427 is a deficient number, since it is larger than the sum of its proper divisors (3558613).

1256065427 is an equidigital number, since it uses as much as digits as its factorization.

1256065427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3558612.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 1256065427 is about 35441.0133461220. The cubic root of 1256065427 is about 1078.9568766205.

The spelling of 1256065427 in words is "one billion, two hundred fifty-six million, sixty-five thousand, four hundred twenty-seven".