256392193 has 4 divisors (see below), whose sum is σ = 256451140. Its totient is φ = 256333248.

The previous prime is 256392139. The next prime is 256392221. The reversal of 256392193 is 391293652.

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 13749264 + 242642929 = 3708^2 + 15577^2 .

It is a cyclic number.

It is not a de Polignac number, because 256392193 - 2¹⁷ = 256261121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256395193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22380 + ... + 31837.

It is an arithmetic number, because the mean of its divisors is an integer number (64112785).

Almost surely, 2^256392193 is an apocalyptic number.

It is an amenable number.

256392193 is a deficient number, since it is larger than the sum of its proper divisors (58947).

256392193 is an equidigital number, since it uses as much as digits as its factorization.

256392193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58946.

The product of its digits is 87480, while the sum is 40.

The square root of 256392193 is about 16012.2513407703. The cubic root of 256392193 is about 635.2845092903.

The spelling of 256392193 in words is "two hundred fifty-six million, three hundred ninety-two thousand, one hundred ninety-three".