257741261 has 4 divisors (see below), whose sum is σ = 258159612. Its totient is φ = 257322912.

The previous prime is 257741249. The next prime is 257741273. The reversal of 257741261 is 162147752.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (257741249) and next prime (257741273).

It can be written as a sum of positive squares in 2 ways, for example, as 63696361 + 194044900 = 7981^2 + 13930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257741261 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 (257741201) 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 in 3 ways as a sum of consecutive naturals, for example, 208250 + ... + 209483.

It is an arithmetic number, because the mean of its divisors is an integer number (64539903).

Almost surely, 2^257741261 is an apocalyptic number.

It is an amenable number.

257741261 is a deficient number, since it is larger than the sum of its proper divisors (418351).

257741261 is an equidigital number, since it uses as much as digits as its factorization.

257741261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418350.

The product of its digits is 23520, while the sum is 35.

The square root of 257741261 is about 16054.3221906127. The cubic root of 257741261 is about 636.3967938141.

The spelling of 257741261 in words is "two hundred fifty-seven million, seven hundred forty-one thousand, two hundred sixty-one".