256612249 has 2 divisors, whose sum is σ = 256612250. Its totient is φ = 256612248.

The previous prime is 256612241. The next prime is 256612253. The reversal of 256612249 is 942216652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155750400 + 100861849 = 12480^2 + 10043^2 .

It is a cyclic number.

It is not a de Polignac number, because 256612249 - 2³ = 256612241 is a prime.

It is not a weakly prime, because it can be changed into another prime (256612241) 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 as a sum of consecutive naturals, namely, 128306124 + 128306125.

It is an arithmetic number, because the mean of its divisors is an integer number (128306125).

Almost surely, 2^256612249 is an apocalyptic number.

It is an amenable number.

256612249 is a deficient number, since it is larger than the sum of its proper divisors (1).

256612249 is an equidigital number, since it uses as much as digits as its factorization.

256612249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 256612249 is about 16019.1213554302. The cubic root of 256612249 is about 635.4662077397.

The spelling of 256612249 in words is "two hundred fifty-six million, six hundred twelve thousand, two hundred forty-nine".