256506037 has 4 divisors (see below), whose sum is σ = 260711116. Its totient is φ = 252300960.

The previous prime is 256506007. The next prime is 256506043. The reversal of 256506037 is 730605652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27468081 + 229037956 = 5241^2 + 15134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256506037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256505993 and 256506011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256506007) 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 3 ways as a sum of consecutive naturals, for example, 2102448 + ... + 2102569.

It is an arithmetic number, because the mean of its divisors is an integer number (65177779).

Almost surely, 2^256506037 is an apocalyptic number.

It is an amenable number.

256506037 is a deficient number, since it is larger than the sum of its proper divisors (4205079).

256506037 is an equidigital number, since it uses as much as digits as its factorization.

256506037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205078.

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 256506037 is about 16015.8058492228. The cubic root of 256506037 is about 635.3785223295.

The spelling of 256506037 in words is "two hundred fifty-six million, five hundred six thousand, thirty-seven".