256241557 has 8 divisors (see below), whose sum is σ = 301039200. Its totient is φ = 215027760.

The previous prime is 256241549. The next prime is 256241569. The reversal of 256241557 is 755142652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256241557 - 2³ = 256241549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256241857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 895807 + ... + 896092.

It is an arithmetic number, because the mean of its divisors is an integer number (37629900).

Almost surely, 2^256241557 is an apocalyptic number.

It is an amenable number.

256241557 is a deficient number, since it is larger than the sum of its proper divisors (44797643).

256241557 is a wasteful number, since it uses less digits than its factorization.

256241557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791923.

The product of its digits is 84000, while the sum is 37.

The square root of 256241557 is about 16007.5468763955. The cubic root of 256241557 is about 635.1600704197.

The spelling of 256241557 in words is "two hundred fifty-six million, two hundred forty-one thousand, five hundred fifty-seven".