256424197 has 2 divisors, whose sum is σ = 256424198. Its totient is φ = 256424196.

The previous prime is 256424191. The next prime is 256424213. The reversal of 256424197 is 791424652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142062561 + 114361636 = 11919^2 + 10694^2 .

It is a cyclic number.

It is not a de Polignac number, because 256424197 - 2¹¹ = 256422149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256424191) 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, 128212098 + 128212099.

It is an arithmetic number, because the mean of its divisors is an integer number (128212099).

Almost surely, 2^256424197 is an apocalyptic number.

It is an amenable number.

256424197 is a deficient number, since it is larger than the sum of its proper divisors (1).

256424197 is an equidigital number, since it uses as much as digits as its factorization.

256424197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 256424197 is about 16013.2506693675. The cubic root of 256424197 is about 635.3109411917.

The spelling of 256424197 in words is "two hundred fifty-six million, four hundred twenty-four thousand, one hundred ninety-seven".