256842101 has 4 divisors (see below), whose sum is σ = 257973792. Its totient is φ = 255710412.

The previous prime is 256842073. The next prime is 256842151. The reversal of 256842101 is 101248652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256842101 - 2¹⁰ = 256841077 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 (256842151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565505 + ... + 565958.

It is an arithmetic number, because the mean of its divisors is an integer number (64493448).

Almost surely, 2^256842101 is an apocalyptic number.

It is an amenable number.

256842101 is a deficient number, since it is larger than the sum of its proper divisors (1131691).

256842101 is a wasteful number, since it uses less digits than its factorization.

256842101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131690.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 256842101 is about 16026.2940507155. The cubic root of 256842101 is about 635.6558837855.

The spelling of 256842101 in words is "two hundred fifty-six million, eight hundred forty-two thousand, one hundred one".