256198277 has 4 divisors (see below), whose sum is σ = 256658796. Its totient is φ = 255737760.

The previous prime is 256198259. The next prime is 256198289. The reversal of 256198277 is 772891652.

It is a happy number.

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 21771556 + 234426721 = 4666^2 + 15311^2 .

It is a cyclic number.

It is not a de Polignac number, because 256198277 - 2⁶ = 256198213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256198247) 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 in 3 ways as a sum of consecutive naturals, for example, 229424 + ... + 230537.

It is an arithmetic number, because the mean of its divisors is an integer number (64164699).

Almost surely, 2^256198277 is an apocalyptic number.

It is an amenable number.

256198277 is a deficient number, since it is larger than the sum of its proper divisors (460519).

256198277 is an equidigital number, since it uses as much as digits as its factorization.

256198277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460518.

The product of its digits is 423360, while the sum is 47.

The square root of 256198277 is about 16006.1949569534. The cubic root of 256198277 is about 635.1243082324.

The spelling of 256198277 in words is "two hundred fifty-six million, one hundred ninety-eight thousand, two hundred seventy-seven".