256142671 has 4 divisors (see below), whose sum is σ = 256392144. Its totient is φ = 255893200.

The previous prime is 256142669. The next prime is 256142681. The reversal of 256142671 is 176241652.

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 256142671 - 2¹ = 256142669 is a prime.

It is a super-3 number, since 3×256142671³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256142681) 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, 123190 + ... + 125251.

It is an arithmetic number, because the mean of its divisors is an integer number (64098036).

Almost surely, 2^256142671 is an apocalyptic number.

256142671 is a deficient number, since it is larger than the sum of its proper divisors (249473).

256142671 is a wasteful number, since it uses less digits than its factorization.

256142671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249472.

The product of its digits is 20160, while the sum is 34.

The square root of 256142671 is about 16004.4578477373. The cubic root of 256142671 is about 635.0783551811.

The spelling of 256142671 in words is "two hundred fifty-six million, one hundred forty-two thousand, six hundred seventy-one".