256012609 has 16 divisors (see below), whose sum is σ = 277286400. Its totient is φ = 235642176.

The previous prime is 256012607. The next prime is 256012621. The reversal of 256012609 is 906210652.

It is not a de Polignac number, because 256012609 - 2¹ = 256012607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256012607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308407 + ... + 309235.

It is an arithmetic number, because the mean of its divisors is an integer number (17330400).

Almost surely, 2^256012609 is an apocalyptic number.

256012609 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

256012609 is a deficient number, since it is larger than the sum of its proper divisors (21273791).

256012609 is a wasteful number, since it uses less digits than its factorization.

256012609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 256012609 is about 16000.3940263982. The cubic root of 256012609 is about 634.9708453765.

The spelling of 256012609 in words is "two hundred fifty-six million, twelve thousand, six hundred nine".