256532537 has 2 divisors, whose sum is σ = 256532538. Its totient is φ = 256532536.

The previous prime is 256532519. The next prime is 256532543. The reversal of 256532537 is 735235652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239135296 + 17397241 = 15464^2 + 4171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256532537 is a prime.

It is a super-3 number, since 3×256532537³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256532537.

It is not a weakly prime, because it can be changed into another prime (256592537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128266268 + 128266269.

It is an arithmetic number, because the mean of its divisors is an integer number (128266269).

Almost surely, 2^256532537 is an apocalyptic number.

It is an amenable number.

256532537 is a deficient number, since it is larger than the sum of its proper divisors (1).

256532537 is an equidigital number, since it uses as much as digits as its factorization.

256532537 is an odious number, because the sum of its binary digits is odd.

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

The square root of 256532537 is about 16016.6331355875. The cubic root of 256532537 is about 635.4004021928.

The spelling of 256532537 in words is "two hundred fifty-six million, five hundred thirty-two thousand, five hundred thirty-seven".