256117571 has 8 divisors (see below), whose sum is σ = 261800640. Its totient is φ = 250466112.

The previous prime is 256117559. The next prime is 256117579. The reversal of 256117571 is 175711652.

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 256117571 - 2¹⁴ = 256101187 is a prime.

It is a super-3 number, since 3×256117571³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256117579) 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, 8870 + ... + 24308.

It is an arithmetic number, because the mean of its divisors is an integer number (32725080).

Almost surely, 2^256117571 is an apocalyptic number.

256117571 is a deficient number, since it is larger than the sum of its proper divisors (5683069).

256117571 is a wasteful number, since it uses less digits than its factorization.

256117571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15805.

The product of its digits is 14700, while the sum is 35.

The square root of 256117571 is about 16003.6736720042. The cubic root of 256117571 is about 635.0576102484.

The spelling of 256117571 in words is "two hundred fifty-six million, one hundred seventeen thousand, five hundred seventy-one".