256529397 has 16 divisors (see below), whose sum is σ = 346462272. Its totient is φ = 168819840.

The previous prime is 256529363. The next prime is 256529407. The reversal of 256529397 is 793925652.

It is not a de Polignac number, because 256529397 - 2¹⁰ = 256528373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256529347) 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 15 ways as a sum of consecutive naturals, for example, 100497 + ... + 103017.

It is an arithmetic number, because the mean of its divisors is an integer number (21653892).

Almost surely, 2^256529397 is an apocalyptic number.

It is an amenable number.

256529397 is a deficient number, since it is larger than the sum of its proper divisors (89932875).

256529397 is a wasteful number, since it uses less digits than its factorization.

256529397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948.

The product of its digits is 1020600, while the sum is 48.

The square root of 256529397 is about 16016.5351121895. The cubic root of 256529397 is about 635.3978097141.

The spelling of 256529397 in words is "two hundred fifty-six million, five hundred twenty-nine thousand, three hundred ninety-seven".