256532573 has 4 divisors (see below), whose sum is σ = 279853728. Its totient is φ = 233211420.

The previous prime is 256532569. The next prime is 256532603. The reversal of 256532573 is 375235652.

Added to its reverse (375235652) it gives a square (631768225 = 25135²).

256532573 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256532573 - 2² = 256532569 is a prime.

It is a super-2 number, since 2×256532573² = 131617922020000658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256532503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11660561 + ... + 11660582.

It is an arithmetic number, because the mean of its divisors is an integer number (69963432).

Almost surely, 2^256532573 is an apocalyptic number.

It is an amenable number.

256532573 is a deficient number, since it is larger than the sum of its proper divisors (23321155).

256532573 is a wasteful number, since it uses less digits than its factorization.

256532573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23321154.

The product of its digits is 189000, while the sum is 38.

The square root of 256532573 is about 16016.6342594192. The cubic root of 256532573 is about 635.4004319153.

Adding to 256532573 its reverse (375235652), we get a square (631768225 = 25135²).

The spelling of 256532573 in words is "two hundred fifty-six million, five hundred thirty-two thousand, five hundred seventy-three".