256181623 has 2 divisors, whose sum is σ = 256181624. Its totient is φ = 256181622.

The previous prime is 256181593. The next prime is 256181663. The reversal of 256181623 is 326181652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256181623 - 2¹³ = 256173431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256181663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128090811 + 128090812.

It is an arithmetic number, because the mean of its divisors is an integer number (128090812).

Almost surely, 2^256181623 is an apocalyptic number.

256181623 is a deficient number, since it is larger than the sum of its proper divisors (1).

256181623 is an equidigital number, since it uses as much as digits as its factorization.

256181623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 256181623 is about 16005.6747124262. The cubic root of 256181623 is about 635.1105459886.

The spelling of 256181623 in words is "two hundred fifty-six million, one hundred eighty-one thousand, six hundred twenty-three".