256509102 has 8 divisors (see below), whose sum is σ = 513018216. Its totient is φ = 85503032.

The previous prime is 256509091. The next prime is 256509103. The reversal of 256509102 is 201905652.

It is a happy number.

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

256509102 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 256509102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256509103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21375753 + ... + 21375764.

It is an arithmetic number, because the mean of its divisors is an integer number (64127277).

Almost surely, 2^256509102 is an apocalyptic number.

256509102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256509102 is a wasteful number, since it uses less digits than its factorization.

256509102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42751522.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 256509102 is about 16015.9015356614. The cubic root of 256509102 is about 635.3810530398.

The spelling of 256509102 in words is "two hundred fifty-six million, five hundred nine thousand, one hundred two".