256319129 has 8 divisors (see below), whose sum is σ = 288641280. Its totient is φ = 225500400.

The previous prime is 256319123. The next prime is 256319131. The reversal of 256319129 is 921913652.

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

It is a cyclic number.

It is not a de Polignac number, because 256319129 - 2¹⁶ = 256253593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256319092 and 256319101.

It is not an unprimeable number, because it can be changed into a prime (256319123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375494 + ... + 376175.

It is an arithmetic number, because the mean of its divisors is an integer number (36080160).

Almost surely, 2^256319129 is an apocalyptic number.

It is an amenable number.

256319129 is a deficient number, since it is larger than the sum of its proper divisors (32322151).

256319129 is a wasteful number, since it uses less digits than its factorization.

256319129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751711.

The product of its digits is 29160, while the sum is 38.

The square root of 256319129 is about 16009.9696751743. The cubic root of 256319129 is about 635.2241579504.

The spelling of 256319129 in words is "two hundred fifty-six million, three hundred nineteen thousand, one hundred twenty-nine".