256601423 has 4 divisors (see below), whose sum is σ = 276340008. Its totient is φ = 236862840.

The previous prime is 256601419. The next prime is 256601431. The reversal of 256601423 is 324106652.

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 256601423 - 2² = 256601419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256601123) 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, 9869273 + ... + 9869298.

It is an arithmetic number, because the mean of its divisors is an integer number (69085002).

Almost surely, 2^256601423 is an apocalyptic number.

256601423 is a deficient number, since it is larger than the sum of its proper divisors (19738585).

256601423 is a wasteful number, since it uses less digits than its factorization.

256601423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19738584.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 256601423 is about 16018.7834431957. The cubic root of 256601423 is about 635.4572712296.

The spelling of 256601423 in words is "two hundred fifty-six million, six hundred one thousand, four hundred twenty-three".