1256600401 has 16 divisors (see below), whose sum is σ = 1476357760. Its totient is φ = 1046960640.

The previous prime is 1256600383. The next prime is 1256600417. The reversal of 1256600401 is 1040066521.

It is a cyclic number.

It is not a de Polignac number, because 1256600401 - 2⁷ = 1256600273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256600461) 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, 394945 + ... + 398113.

It is an arithmetic number, because the mean of its divisors is an integer number (92272360).

Almost surely, 2^1256600401 is an apocalyptic number.

It is an amenable number.

1256600401 is a deficient number, since it is larger than the sum of its proper divisors (219757359).

1256600401 is a wasteful number, since it uses less digits than its factorization.

1256600401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1256600401 is about 35448.5599284371. The cubic root of 1256600401 is about 1079.1100352950.

Adding to 1256600401 its reverse (1040066521), we get a palindrome (2296666922).

The spelling of 1256600401 in words is "one billion, two hundred fifty-six million, six hundred thousand, four hundred one".