256109901 has 8 divisors (see below), whose sum is σ = 343099104. Its totient is φ = 169930320.

The previous prime is 256109897. The next prime is 256109923. The reversal of 256109901 is 109901652.

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

It is not a de Polignac number, because 256109901 - 2² = 256109897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256109201) 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 7 ways as a sum of consecutive naturals, for example, 201666 + ... + 202931.

It is an arithmetic number, because the mean of its divisors is an integer number (42887388).

Almost surely, 2^256109901 is an apocalyptic number.

It is an amenable number.

256109901 is a deficient number, since it is larger than the sum of its proper divisors (86989203).

256109901 is a wasteful number, since it uses less digits than its factorization.

256109901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404811.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 256109901 is about 16003.4340377308. The cubic root of 256109901 is about 635.0512707894.

It can be divided in two parts, 25610 and 9901, that added together give a triangular number (35511 = T₂₆₆).

The spelling of 256109901 in words is "two hundred fifty-six million, one hundred nine thousand, nine hundred one".