257136769 has 4 divisors (see below), whose sum is σ = 257948244. Its totient is φ = 256325296.

The previous prime is 257136767. The next prime is 257136779. The reversal of 257136769 is 967631752.

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 57988225 + 199148544 = 7615^2 + 14112^2 .

It is a cyclic number.

It is not a de Polignac number, because 257136769 - 2¹ = 257136767 is a prime.

It is a super-2 number, since 2×257136769² = 132238635943518722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257136767) 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, 405262 + ... + 405895.

It is an arithmetic number, because the mean of its divisors is an integer number (64487061).

Almost surely, 2^257136769 is an apocalyptic number.

It is an amenable number.

257136769 is a deficient number, since it is larger than the sum of its proper divisors (811475).

257136769 is an equidigital number, since it uses as much as digits as its factorization.

257136769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811474.

The product of its digits is 476280, while the sum is 46.

The square root of 257136769 is about 16035.4846824161. The cubic root of 257136769 is about 635.8988811523.

It can be divided in two parts, 2571 and 36769, that added together give a triangular number (39340 = T₂₈₀).

The spelling of 257136769 in words is "two hundred fifty-seven million, one hundred thirty-six thousand, seven hundred sixty-nine".